Optical system for adjusting fundus light spots and eye illumination therapeutic apparatus

Abstract

The invention discloses an optical system for adjusting fundus light spots and an eye illumination therapeutic apparatus. The optical system comprises a light source, a first aperture-adjustable diaphragm, an illumination lens, a second aperture-adjustable diaphragm, a projection lens and an adjustment controller, the second aperture-adjustable diaphragm is tightly attached to the illumination lens, and an exit pupil plane of the illumination lens is located on a front focal plane of the projection lens; wherein the adjusting controller is connected with the first aperture adjustable diaphragm and the second aperture adjustable diaphragm and is configured to adjust the aperture of the second aperture adjustable diaphragm according to the size of a target light spot; determining a first light spot power adjusting curve according to the aperture of the second aperture adjustable diaphragm; and adjusting the aperture of the first aperture-adjustable diaphragm according to the target light spot power and the first light spot power adjustment curve to form a target light spot. According to the scheme of the embodiment of the invention, the power and the size of the fundus light spot can be flexibly adjusted, so that the optical system can adapt to different people.

Description

Technical Field

[0001] This disclosure generally relates to the field of optical technologies. More specifically, this disclosure relates to an optical system for adjusting a fundus light spot and an eye illumination treatment device. Background Art

[0002] Existing research shows that directly irradiating the retina with long-wavelength red light of 650 nm can effectively inhibit the growth of the eye axis length. Since the growth of the eye axis is one of the main factors causing myopia, therefore, the prior art provides an optical solution that uses red light to irradiate the fundus retina to achieve the effect of myopia prevention and control.

[0003] Currently, the commonly used red light source, the laser diode, is approximately a point source with a small light-emitting area. When a person directly looks at the light source or observes the image of the light source after being transformed by a lens, the human eye will adjust the fovea to face the light source itself, thus seeing a circular spot with a relatively high central brightness. Since the power of the laser is relatively high, it increases the power density of the fundus, resulting in certain damage to the eyes caused by the light source. In addition, when more red light energy is concentrated in the center of the macula area, the red light energy in the peripheral macula area is very weak, which causes uneven illumination stimulation of the macula area and affects the actual effect of red light irradiation in inhibiting the growth of the eye axis.

[0004] To solve the above problems, a light homogenizing plate is introduced in the optical solution in the prior art. However, this light homogenizing solution has the following problems: First, after the laser hits the light homogenizing plate, it is scattered at large angles, resulting in serious attenuation of the light energy when reaching the pupil position, and the incident light power cannot be guaranteed. Second, due to individual differences in the human body, there are differences when using the device, and this light homogenizing solution lacks effective control over the attributes of the fundus light spot, such as the power and size of the fundus light spot.

[0005] In view of this, there is an urgent need to provide an optical solution to flexibly adjust the power and size of the fundus light spot, so that the optical system for outputting the fundus light spot can be adapted to different people. Summary of the Invention

[0006] To solve at least one or more of the above-mentioned technical problems, this disclosure proposes optical solutions in multiple aspects.

[0007] In a first aspect, the present disclosure provides an optical system for adjusting a fundus light spot, comprising: a light source, a first aperture-adjustable diaphragm, an illumination lens, a second aperture-adjustable diaphragm, a projection lens, and an adjustment controller. The light source, the first aperture-adjustable diaphragm, the illumination lens, the second aperture-adjustable diaphragm, and the projection lens are arranged in sequence along the optical path. The second aperture-adjustable diaphragm is closely attached to the illumination lens, and the exit pupil plane of the illumination lens is located at the front focal plane of the projection lens. The adjustment controller is respectively connected to the first aperture-adjustable diaphragm and the second aperture-adjustable diaphragm, and is configured to: adjust the aperture of the second aperture-adjustable diaphragm according to the target light spot size; determine a first light spot power adjustment curve according to the aperture of the second aperture-adjustable diaphragm; and adjust the aperture of the first aperture-adjustable diaphragm according to the target light spot power and the first light spot power adjustment curve to form a target light spot.

[0008] In some embodiments, adjusting the aperture of the second aperture-adjustable diaphragm according to the target light spot size includes: obtaining a preset light spot size adjustment curve or a light spot size mapping table; and substituting the target light spot size into the preset light spot size adjustment curve or the light spot size mapping table to obtain the target aperture of the second aperture-adjustable diaphragm; adjusting the second aperture-adjustable diaphragm according to the target aperture of the second aperture-adjustable diaphragm.

[0009] In some embodiments, determining the first light spot power adjustment curve according to the aperture of the second aperture-adjustable diaphragm includes: calling a first curve coefficient mapping table; determining a first coefficient array in the first curve coefficient mapping table according to the target light spot size or the aperture of the second aperture-adjustable diaphragm; and determining the first light spot power adjustment curve based on the first coefficient array.

[0010] In some embodiments, the preset light spot size adjustment curve is S = -0.42X 2 +3.0533, where S represents the light spot size and X 2 represents the aperture of the second aperture-adjustable diaphragm.

[0011] In some embodiments, the first aperture-adjustable diaphragm is closely attached to the light source, and the first curve coefficient mapping table is as follows:

[0012] S / mm <![CDATA[X 2 / mm]]> a1 a2 a3 a4 a5 0.6 5.84 0.00008 -0.0022 0.0175 -0.0522 0.2098 0.9 5.13 0.0004 -0.0095 0.0752 -0.2103 0.8064 1.4 3.94 0.0008 -0.0208 0.1631 -0.4527 1.7651 1.7 3.22 0.0011 -0.0293 0.2145 -0.5615 3.0303 2.2 2.03 0.0014 -0.0332 0.2132 -0.4835 4.5071 2.7 0.84 0.0017 -0.0405 0.2396 -0.5333 6.585

[0013] where S represents the light spot size and X 2 represents the aperture of the second aperture-adjustable diaphragm, [a1, a2, a3, a4, a5] is the first coefficient array, and a1 to a5 represent the first light spot power adjustment curve W = a1X 1 4 +a2X 1 3 +a3X 1 2 +a4X 1The binomial coefficients in +a5, W represents the spot power, X 1 represents the aperture of the first aperture-adjustable diaphragm.

[0014] In some embodiments, both the first aperture-adjustable diaphragm and the second aperture-adjustable diaphragm include:

[0015] a plurality of vanes, which are symmetrically distributed about the center;

[0016] a turntable, which drives the plurality of vanes to move through a cam pair; and

[0017] a drive motor, which is respectively connected to the turntable and the adjustment controller to drive the turntable to rotate under the control of the adjustment controller, so as to drive the plurality of vanes to perform opening and closing actions through the cam pair.

[0018] In a second aspect, the present disclosure provides an optical system for adjusting a fundus spot, including: a light source, a first diaphragm, an illumination lens, a second diaphragm, a projection lens, and an adjustment controller. The light source, the first diaphragm, the illumination lens, the second diaphragm, and the projection lens are sequentially arranged along the optical path. The second diaphragm is an aperture-adjustable diaphragm and is closely attached to the illumination lens. The exit pupil plane of the illumination lens is located at the front focal plane of the projection lens. The adjustment controller is respectively connected to the first diaphragm and the second diaphragm and is configured to: adjust the aperture of the second diaphragm according to the target spot size; determine a second spot power adjustment curve according to the aperture of the second diaphragm and the aperture of the first diaphragm; and adjust the position of the first diaphragm according to the target spot power and the second spot power adjustment curve to form a target spot.

[0019] In some embodiments, adjusting the position of the first diaphragm according to the target spot power and the second spot power adjustment curve includes: adjusting the distance between the first diaphragm and the light source according to the target spot power and the second spot power adjustment curve.

[0020] In some embodiments, determining the second spot power adjustment curve according to the aperture of the second diaphragm and the aperture of the first diaphragm includes: calling a second curve coefficient mapping table; determining a second coefficient array in the first curve coefficient mapping table according to the aperture of the first diaphragm and the aperture of the second diaphragm; and determining the second spot power adjustment curve based on the second coefficient array.

[0021] In some embodiments, the second curve coefficient mapping table is as follows:

[0022] <![CDATA[X 1 ′ / mm]]> <![CDATA[X 2 ′ / mm]]> b1 b2 b3 b4 2 4 0.0118 -0.1156 0.009 2.6095 2 6 0.0352 -0.3458 0.229 5.8625 3 4 0.013 -0.1224 0.0003 2.6592 3 6 0.0274 -0.2674 -0.0376 6.3628

[0023] wherein, X 1 ′ represents the aperture of the first diaphragm, X 2 ′ represents the aperture of the second diaphragm, [b1, b2, b3, b4] represents the second coefficient array, and b1 to b4 respectively represent the second spot power adjustment curve W′ = b1D3 +b2D 2 The polynomial coefficients in +b3D + b4, W' represents the spot power, and D represents the distance between the first aperture stop and the light source.

[0024] In some embodiments, adjusting the aperture of the second aperture stop according to the target spot size includes: obtaining a preset spot size adjustment curve or a spot size mapping table; substituting the target spot size into the preset spot size adjustment curve or the spot size mapping table to obtain the target aperture of the second aperture stop; and adjusting the second aperture stop according to the target aperture of the second aperture stop.

[0025] In some embodiments, the preset spot size adjustment curve is S = -0.42X 2 ′ + 3.0533, where S represents the spot size and X 2 ′ represents the aperture of the second aperture stop.

[0026] In some embodiments, the first aperture stop is an aperture-adjustable aperture stop, and the adjustment controller is further configured to: adjust the aperture of the first aperture stop to adjust the spot power.

[0027] In a third aspect, the present disclosure provides a method for adjusting a fundus spot, which is applied to an optical system for adjusting a fundus spot. The optical system includes: a light source, a first aperture-adjustable aperture stop, an illumination lens, a second aperture-adjustable aperture stop, a projection lens, and an adjustment controller. The light source, the first aperture-adjustable aperture stop, the illumination lens, the second aperture-adjustable aperture stop, and the projection lens are arranged in sequence along the optical path. The second aperture-adjustable aperture stop is closely attached to the illumination lens, and the exit pupil plane of the illumination lens is located in the front focal plane of the projection lens. The method includes: adjusting the aperture of the second aperture-adjustable aperture stop according to the target spot size; determining a first spot power adjustment curve according to the aperture of the second aperture-adjustable aperture stop; and adjusting the aperture of the first aperture-adjustable aperture stop according to the target spot power and the first spot power adjustment curve to form a target spot.

[0028] In a fourth aspect, the present disclosure provides a method for adjusting a fundus spot, which is applied to an optical system for adjusting a fundus spot. The optical system includes: a light source, a first aperture stop, an illumination lens, a second aperture stop, a projection lens, and an adjustment controller. The light source, the first aperture stop, the illumination lens, the second aperture stop, and the projection lens are arranged in sequence along the optical path. The second aperture stop is an aperture-adjustable aperture stop and is closely attached to the illumination lens, and the exit pupil plane of the illumination lens is located in the front focal plane of the projection lens. The method includes: adjusting the aperture of the second aperture stop according to the target spot size; determining a second spot power adjustment curve according to the aperture of the second aperture stop and the aperture of the first aperture stop; and adjusting the position of the first aperture stop according to the target spot power and the second spot power adjustment curve to form a target spot.

[0029] In a fifth aspect, the present disclosure provides an eye light therapy device comprising: a barrel and an optical system according to any one of the first aspect, wherein a light source, a first aperture-adjustable diaphragm, an illumination lens, a second aperture-adjustable diaphragm, and a projection lens in the optical system are disposed in the barrel, and the light source is disposed near one end of the barrel, and the other end of the barrel is flush with the rear focal plane of the projection lens for being attached to the eye during use; alternatively, the eye light therapy device comprises: a barrel and an optical system according to any one of the second aspect, wherein a light source, a first diaphragm, an illumination lens, a second diaphragm, and a projection lens in the optical system are disposed in the barrel, and the light source is disposed near one end of the barrel, and the other end of the barrel is flush with the rear focal plane of the projection lens for being attached to the eye during use.

[0030] Through the optical system for adjusting the fundus light spot provided as above, in the embodiments of the present disclosure, the size of the fundus light spot is controlled by adjusting the aperture size of the second aperture-adjustable diaphragm, and the light spot power adjustment curve matching the current scene can be retrieved based on the aperture of the determined second aperture-adjustable diaphragm to ensure the accuracy of the curve referred to during power adjustment. Based on the matched light spot power adjustment curve, the power of the fundus light spot can be controlled by adjusting the first aperture-adjustable diaphragm, so that the output light spot meets the requirements of the customized target light spot. The optical system for outputting the fundus light spot is flexible and controllable, and can adapt to the needs of different people. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the drawings, several embodiments of the present disclosure are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0032] Figure 1 An exemplary structural diagram of an optical system for adjusting a fundus light spot according to some embodiments of the present disclosure is shown;

[0033] Figure 2 An exemplary flowchart of a method for adjusting a fundus light spot according to some embodiments of the present disclosure is shown;

[0034] Figure 3 An exemplary flowchart of a method for adjusting a fundus light spot according to some other embodiments of the present disclosure is shown;

[0035] Figure 4 An exemplary flowchart of a method for adjusting the size of a fundus light spot according to an embodiment of the present disclosure is shown;

[0036] Figure 5 An exemplary flowchart of a method for determining a first light spot power adjustment curve according to an embodiment of the present disclosure is shown;

[0037] Figure 6 An exemplary flowchart of the method for determining the second light spot power adjustment curve according to an embodiment of the present disclosure is shown;

[0038] Figure 7 An exemplary structural diagram of an eye illumination treatment device according to an embodiment of the present disclosure is shown. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present disclosure.

[0040] It should be understood that the terms "including" and "comprising" used in the specification and claims of the present disclosure indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0041] It should also be understood that the terms used in the specification of the present disclosure are only for the purpose of describing specific embodiments, and are not intended to limit the present disclosure. As used in the specification and claims of the present disclosure, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms. It should be further understood that the term "and / or" used in the specification and claims of the present disclosure refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0042] As used in this specification and the claims, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" according to the context. Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]" according to the context.

[0043] Next, the detailed implementation manners of the present disclosure will be described in detail in conjunction with the accompanying drawings.

[0044] Exemplary application scenarios

[0045] Due to the strong penetrability of the long-wavelength red light at 650 nm, when it irradiates the human eye, it can penetrate the retina and act on the choroid simultaneously. Also, due to its thermal effect, it will open the bottleneck-like stenosis at the opening of the small arteries in the choroid lobules, increasing the blood flow into the lobules, thereby increasing the microcirculation blood volume. After the choroid thickness thickens, the sclera is not oxygen-deficient, so the thinned choroid can be restored to the normal thickness, providing sufficient oxygen for the sclera, and thus improving the blood circulation in the fundus. In addition, the 650-nm long-wavelength red light can make the retinal epithelial pigment cells secrete dopamine, thereby effectively inhibiting the excessive growth of the eye axis.

[0046] Based on the above principle, the prior art provides an optical solution that uses red light to irradiate the fundus retina to achieve the effect of myopia prevention and control. However, since the commonly used red light source, the laser diode, is approximately a point source with a small luminous area, when the human eye directly looks at the light source or observes the image of the light source after being transformed by a lens, the fovea will be adjusted to face the light source itself, and a circular spot with a higher central brightness will be seen. The energy of this circular spot is more concentrated in the center of the macula area, resulting in uneven illumination stimulation in the macula area. Moreover, the high-power laser increases the power density of the circular spot, which not only affects the inhibitory effect on eye axis growth but also may cause additional damage to the fundus.

[0047] Some other existing optical solutions use a light homogenizing plate to improve the uniformity of the fundus light spot. However, on the one hand, this solution will cause the laser to be scattered at large angles, resulting in excessive energy attenuation. On the other hand, this solution lacks effective control over the properties of the fundus light spot and cannot achieve a customized irradiation solution for different people, with poor adaptability.

[0048] Exemplary application solution

[0049] In view of this, the embodiments of the present disclosure provide an optical solution that controls the size of the fundus light spot by adjusting the aperture size of the second aperture-adjustable diaphragm, and further extracts a light spot power adjustment curve that matches the current scenario based on the determined aperture of the second aperture-adjustable diaphragm, and adjusts the first aperture-adjustable diaphragm based on this light spot power adjustment curve, thereby completing the power control of the fundus light spot and achieving flexible control of the fundus light spot.

[0050] Figure 1 Fig. shows an exemplary structural diagram of an optical system 100 for adjusting the fundus light spot according to some embodiments of the present disclosure. As Figure 1 shown, the optical system includes: a light source 10, a first aperture-adjustable diaphragm 20, an illumination lens 30, a second aperture-adjustable diaphragm 40, and a projection lens 50 arranged in sequence along the optical path, where the second aperture-adjustable diaphragm 40 is closely attached to the illumination lens 30.

[0051] Furthermore, the illumination lens 30 and the projection lens 50 form a Köhler illumination structure. In this embodiment, the installation positions of the optical elements meet the following conditions:

[0052] First, the exit pupil plane of the illumination lens 30 is located between the illumination lens 30 and the projection lens 40 and is close to the illumination lens 30. That is to say, the exit pupil plane of the illumination lens 30 is located behind the illumination lens 30 and at a position close to its rear surface. Such a setting can make the light spot energy distribution on the exit pupil plane of the illumination lens 30 more uniform.

[0053] Second, the exit pupil plane of the illumination lens 30 is located at the front focal plane of the projection lens 50. After such a setting, when using the eye illumination therapy instrument adopting the above optical system, the light spot distribution on the exit pupil plane of the illumination lens 30 can be projected onto the fundus of the eye, enabling the human eye to see a uniform surface light source.

[0054] When applying this optical system in the eye illumination therapy instrument, it can be designed such that the pupil of the human eye is located at the rear focal plane of the projection lens 50, so that the light emitted from each position on the exit pupil plane of the illumination lens 30 can pass through the pupil and irradiate the fundus of the eye. At this time, the exit pupil plane of the illumination lens is optically conjugate with the fundus of the human eye. Therefore, the actual surface light source distribution seen by the human eye is the image of the light spot distribution on the exit pupil plane and is magnified by a certain ratio according to the focal length of the projection lens.

[0055] Furthermore, the optical elements in this optical system may further include a light homogenizing plate 70. The light homogenizing plate 70 can be arranged at the front focal plane of the illumination lens 30. Such a setting can enable the surface light source scattered by the light homogenizing plate 70 to be uniformly irradiated on the exit pupil plane of the illumination lens 30 after passing through the illumination lens 30. At this time, the first aperture adjustable diaphragm 20 can be arranged between the light homogenizing plate 70 and the illumination lens 30. For example, the light source 10, the light homogenizing plate 70, and the first aperture adjustable diaphragm 20 are closely arranged together.

[0056] In the embodiment disclosed herein, the optical system further includes an adjustment controller 60, which is respectively connected to the first aperture adjustable diaphragm 20 and the second aperture adjustable diaphragm 40 and is configured to adjust to obtain a target light spot by executing Figure 2 the method shown.

[0057] Next, in combination with Figure 2 the method executed by the adjustment controller 60 will be described. Figure 2 FIG. shows an exemplary flowchart of a method 200 for adjusting the fundus light spot according to some embodiments of the present disclosure. As Figure 2As shown, in step S201, the aperture of the second aperture adjustable diaphragm is adjusted according to the target spot size. In the optical system shown in this embodiment, the influence of the first aperture adjustable diaphragm on the output fundus spot size can be ignored, but the second aperture adjustable diaphragm not only affects the size of the fundus spot, but also affects the power of the fundus spot. In view of this, the adjustment controller 60 can first adjust the size of the fundus spot by adjusting the aperture of the second aperture adjustable diaphragm to make it reach the target spot size.

[0058] In step S202, a first spot power adjustment curve is determined according to the aperture of the second aperture adjustable diaphragm. During the adjustment of the fundus spot, when the power of the fundus spot is the dependent variable, there are two independent variables that affect it. One is the second aperture adjustable diaphragm, and the other is the first aperture adjustable diaphragm. Further, the influencing factors of the first aperture adjustable diaphragm include its aperture size and position. In this embodiment, the position of the first aperture adjustable diaphragm is fixed. Therefore, the second independent variable is the aperture of the first aperture adjustable diaphragm.

[0059] It can be seen from this that when the aperture of the second aperture adjustable diaphragm is not determined, there are multiple power change curves of the fundus spot, and it is difficult to control the adjustment accuracy of the power of the fundus spot. Therefore, after performing step S201 to determine the aperture of the second aperture adjustable diaphragm, a unique independent variable and a determined first spot power adjustment curve can be obtained, which is beneficial to accurately adjusting the power of the fundus spot.

[0060] In step S203, the aperture of the first aperture adjustable diaphragm is adjusted according to the target spot power and the first spot power adjustment curve to form a target spot. After determining a unique and scene-adapted first spot power adjustment curve from multiple power change curves of the fundus spot, the target spot power can be substituted into the first spot power adjustment curve to solve for the value of the independent variable that can make the dependent variable reach the specified value, that is, the aperture of the first aperture adjustable diaphragm corresponding to the target spot power.

[0061] The above introduces a method for adjusting the fundus spot. In this method, the independent variables that affect the power of the fundus spot include the aperture of the second aperture adjustable diaphragm and the aperture of the first aperture adjustable diaphragm. In actual applications, the factors that the first aperture adjustable diaphragm affects the power of the fundus spot include not only its aperture size, but also its position in the optical system. Therefore, in some other embodiments, the fundus spot can also be adjusted by adjusting the position of the first aperture adjustable diaphragm.

[0062] For the convenience of those skilled in the art to understand, the following combines Figure 3 Another method for adjusting the fundus spot is described. Before introducing the method of this embodiment, a brief description of the optical system adapted to this method is given first.

[0063] It should be noted that in this embodiment, the optical system adapted to this method is similar to the Figure 1 optical system shown. It also includes: a light source, a first aperture stop, an illumination lens, a second aperture stop, a projection lens, and an adjustment controller. The light source, the first aperture stop, the illumination lens, the second aperture stop, and the projection lens are also arranged in sequence along the optical path. Among them, the second aperture stop is the same as the second aperture-adjustable aperture stop, both of which are aperture-adjustable aperture stops. The adjustment controller is respectively connected to the first aperture stop and the second aperture stop. Further, the optical system may also include a light homogenizing plate.

[0064] In addition, the positions of the optical elements in this optical system can also refer to the Figure 1 optical system shown. The difference is that in this embodiment, the position of the first aperture stop is adjustable, and the first aperture stop can be an aperture-adjustable aperture stop or a fixed-aperture aperture stop, and there is no excessive limitation here.

[0065] In this embodiment, Figure 3 an exemplary flowchart of method 300 for adjusting the fundus light spot in some other embodiments of this disclosure is shown. As Figure 3 shown, in step S301, the aperture of the second aperture stop is adjusted according to the target light spot size. In this embodiment, the content of step S301 is the same as that of step S201 in the previous embodiment, and will not be elaborated here.

[0066] In step S302, a second light spot power adjustment curve is determined according to the aperture of the second aperture stop and the aperture of the first aperture stop. Since the factors affecting the power of the fundus light spot by the first aperture stop include not only its aperture size but also its position in the optical system, in order to reduce the number of independent variables to one, so as to obtain a unique and definite second light spot power adjustment curve among the power change curves of multiple fundus light spots, in addition to determining the aperture of the second aperture stop, it is also necessary to determine the aperture of the first aperture stop.

[0067] In step S303, the position of the first aperture stop is adjusted according to the target light spot power and the second light spot power adjustment curve to form a target light spot. After determining the unique and adapted second light spot power adjustment curve for the current scenario through step S302, the target light spot power can be substituted into the second light spot power adjustment curve to solve for the value of the independent variable that can make the dependent variable reach the specified value, that is, the position of the first aperture stop corresponding to the target light spot power.

[0068] It should be noted that in this embodiment, the position of the first aperture stop refers to the distance between the first aperture stop and the light source. Therefore, step S303 can also be to adjust the distance between the first aperture stop and the light source according to the target light spot power and the second light spot power adjustment curve.

[0069] Further, in this embodiment, when the first aperture stop is an aperture-adjustable stop, the adjustment controller can also adjust the spot power by adjusting the aperture of the first aperture stop. For example, after completing the position adjustment of the first aperture stop, the power can be finely adjusted by adjusting the aperture of the first aperture stop.

[0070] In this embodiment, the size of the fundus spot is controlled by adjusting the aperture of the second aperture stop, and the spot power adjustment curve matching the current scene can be retrieved based on the determined aperture of the second aperture stop to ensure the accuracy of the curve referred to during power adjustment. Based on the matched spot power adjustment curve, the power of the fundus spot can be controlled by adjusting the position of the first aperture stop, so that the output spot meets the requirements of the customized target spot. The optical system for outputting the fundus spot is flexible and controllable and can adapt to the needs of different people.

[0071] In practical applications, the aperture-adjustable stops, including the first aperture-adjustable stop, the second aperture-adjustable stop, and the second aperture stop, can be implemented in various structures. Exemplarily, an aperture-adjustable stop includes: a plurality of blades, a turntable, and a driving motor, wherein the plurality of blades are symmetrically distributed about the center, the turntable drives the plurality of blades to move through a cam pair, and the driving motor is respectively connected to the turntable and the adjustment controller to drive the turntable to rotate under the control of the adjustment controller, so as to drive the plurality of blades to perform opening and closing actions through the cam pair.

[0072] It can be understood that the above description of the aperture-adjustable stop is only an example provided by this disclosure, which does not constitute a limitation on the structures of the first aperture-adjustable stop, the second aperture-adjustable stop, and the second aperture stop in this disclosure. Other structures capable of realizing aperture adjustment are equally applicable to this disclosure.

[0073] Return to Figure 3 , in the case where the first aperture stop is a fixed-aperture stop, the adjustment controller can determine its aperture by identifying the model of the first aperture stop, or by other means such as image recognition. In the case where the first aperture stop is an aperture-adjustable stop, taking the aperture-adjustable stop structure described above as an example, the adjustment controller can calculate the aperture of the first aperture stop in the current state by identifying the rotation angle of the turntable. Similarly, the adjustment controller can also determine the aperture of the first aperture stop in the current state by other means such as image recognition, which will not be elaborated here.

[0074] Based on the method for adjusting the fundus spot provided in any of the foregoing embodiments, this disclosure provides a method for adjusting the size of the fundus spot. Figure 4 An exemplary flowchart of the method 400 for adjusting the size of the fundus spot according to the embodiments of this disclosure is shown. It can be understood that the method for adjusting the size of the fundus spot is a specific implementation of the foregoing step S201 and step S301. Therefore, in combination with the foregoingFigure 2 and Figure 3 The features described can be similarly applied herein.

[0075] As Figure 4 shown, in step S401, a preset spot size adjustment curve or a spot size mapping table is obtained. Since the influence of the first aperture on the fundus spot size output by the optical system can be ignored, there is a one-to-one correspondence between the size of the fundus spot and the second aperture adjustable aperture (which can also be regarded as the second aperture), and this relationship can be represented by a preset spot size adjustment curve or by a spot size mapping table.

[0076] Exemplarily, the preset spot size adjustment curve is S = -0.42X 2 + 3.0533, where S represents the spot size and X 2 represents the aperture of the second aperture adjustable aperture. In some other embodiments, the preset spot size adjustment curve is S = -0.42X 2 '+ 3.0533, where S also represents the spot size and X 2 ' represents the aperture of the second aperture. The array with the mapping relationship in the spot size mapping table is the aperture and spot size that satisfy the above preset spot size adjustment curve, and details are not elaborated here.

[0077] In step S402, the target spot size is substituted into the preset spot size adjustment curve or the spot size mapping table to obtain the target aperture of the second aperture adjustable aperture. It should be noted that the second aperture and the second aperture adjustable aperture are both aperture adjustable apertures. In this embodiment, the second aperture adjustable aperture can also be regarded as the second aperture.

[0078] In this embodiment, in step S402, substituting the target spot size into S in the preset spot size adjustment curve can solve for the corresponding X 2 . Or, by looking up the table, find the mapping array corresponding to the target spot size in the spot size mapping table, and the other value in this mapping array is the required target aperture.

[0079] In step S403, the second aperture adjustable aperture is adjusted according to the target aperture of the second aperture adjustable aperture. The adjustment controller drives the second aperture adjustable aperture (which can also be regarded as the second aperture) to adjust its aperture to this target aperture, so as to obtain a fundus spot with the target spot size.

[0080] Similar to the process of adjusting the size of the fundus spot, the process of adjusting the power of the fundus spot also needs to determine the first spot power adjustment curve or the second spot power adjustment curve, and then use the above spot power adjustment curve and the target spot size to solve the target aperture of the first aperture adjustable aperture or the position of the first aperture.

[0081] First, take the optical system where the first aperture-adjustable diaphragm is located as an example for illustration. After determining the aperture of the second aperture-adjustable diaphragm by the method mentioned in any of the above embodiments, a curve adapted to the current scene can be selected from the power change curves of multiple fundus light spots to complete the power control of the fundus light spot.

[0082] Exemplarily, based on the method shown in the embodiments in combination with Figure 2 previously, the present disclosure provides a method for determining the first light spot power adjustment curve. Figure 5 FIG. shows an exemplary flowchart of the method 500 for determining the first light spot power adjustment curve according to an embodiment of the present disclosure. It can be understood that the method for determining the first light spot power adjustment curve is a specific implementation in the foregoing step S202. Therefore, the features described in combination with Figure 2 previously can be similarly applied herein.

[0083] As Figure 5 shown, in step S501, the first curve coefficient mapping table is called. In some embodiments, the relationship between the power of the fundus light spot and the aperture of the first aperture-adjustable diaphragm can be represented by a fourth-order polynomial, where each polynomial coefficient is related to the aperture of the second aperture-adjustable diaphragm.

[0084] Therefore, before determining the first light spot power adjustment curve, it is necessary to first determine each polynomial coefficient in the fourth-order polynomial, and each polynomial coefficient can be determined from the first curve coefficient mapping table in the form of looking up a table.

[0085] Exemplarily, assuming that the first aperture-adjustable diaphragm is close to the light source, the first curve coefficient mapping table is as follows:

[0086] S / mm <![CDATA[X 2 / mm]]> a1 a2 a3 a4 a5 0.6 5.84 0.00008 -0.0022 0.0175 -0.0522 0.2098 0.9 5.13 0.0004 -0.0095 0.0752 -0.2103 0.8064 1.4 3.94 0.0008 -0.0208 0.1631 -0.4527 1.7651 1.7 3.22 0.0011 -0.0293 0.2145 -0.5615 3.0303 2.2 2.03 0.0014 -0.0332 0.2132 -0.4835 4.5071 2.7 0.84 0.0017 -0.0405 0.2396 -0.5333 6.585

[0087] where S represents the light spot size, X 2 represents the aperture of the second aperture-adjustable diaphragm, [a1, a2, a3, a4, a5] is the first coefficient array, a1 to a5 represent each polynomial coefficient in the first light spot power adjustment curve W = a1X 1 4 + a2X 1 3 + a3X 1 2 + a4X 1 + a5, and W represents the light spot power, and X 1 represents the aperture of the first aperture-adjustable diaphragm.

[0088] It can be understood that the first curve coefficient mapping table described above is an exemplary mapping table provided by this embodiment in the scenario where the first adjustable aperture diaphragm is close to the light source. In actual application, the first adjustable aperture diaphragm can also be fixed at other positions in the optical system. In this case, there is also a first curve coefficient mapping table adapted to the position in the optical system, which will not be elaborated here.

[0089] In step S502, a first coefficient array is determined in a first curve coefficient mapping table according to the target spot size or the aperture of the second adjustable aperture iris. 2 There is a certain functional relationship between S and X, so when determining the first coefficient array, the table lookup action can be completed according to one of the two. Similarly, in the first curve coefficient mapping table described above, one of the columns recording the spot size and the column recording the aperture of the second aperture adjustable diaphragm can be retained in the first curve coefficient mapping table. That is, there can be S and X in the first curve coefficient mapping table. 2 One or both columns of data.

[0090] In step S503, a first spot power adjustment curve is determined based on the first coefficient array. For example, assuming that the target spot size is 0.6 mm, the first spot power adjustment curve can be determined to be W=0.00008× 1 4 -0.0022X 1 3 +0.0175X 1 2 -0.0522X 1 +0.2098, in this first spot power adjustment curve, there is only one independent variable X 1 .

[0091] The following is an example of an optical system where the first aperture is located. Figure 3 The present disclosure provides a method for determining a second spot power adjustment curve. Figure 6 FIG. 6 is an exemplary flow chart of a method 600 for determining a second light spot power adjustment curve according to an embodiment of the present disclosure. It can be understood that the method for determining a second light spot power adjustment curve is a specific implementation of the aforementioned step S302, so the aforementioned method is combined with the method 600 of FIG. Figure 3 The features described can analogously apply here.

[0092] like Figure 6As shown, in step S601, the second curve coefficient mapping table is called. In some embodiments, the relationship between the power of the fundus light spot and the position of the first aperture can be represented by a third-order polynomial, where the coefficients of each term are related to the aperture of the second aperture.

[0093] Therefore, before determining the second light spot power adjustment curve, it is necessary to first determine the coefficients of each term in the third-order polynomial, and the coefficients of each term can be determined from the second curve coefficient mapping table in the form of looking up the table.

[0094] Exemplarily, the second curve coefficient mapping table is as follows:

[0095] <![CDATA[X 1 ′ / mm]]> <![CDATA[X 2 ′ / mm]]> b1 b2 b3 b4 2 4 0.0118 -0.1156 0.009 2.6095 2 6 0.0352 -0.3458 0.229 5.8625 3 4 0.013 -0.1224 0.0003 2.6592 3 6 0.0274 -0.2674 -0.0376 6.3628

[0096] Among them, X 1 ′ represents the aperture of the first aperture, X 2 ′ represents the aperture of the second aperture, [b1, b2, b3, b4] represents the second coefficient array, and b1 to b4 represent the coefficients of each term in the second light spot power adjustment curve W′ = b1D 3 +b2D 2 +b3D + b4 in turn, W′ represents the light spot power, and D represents the distance between the first aperture and the light source.

[0097] In step S602, according to the aperture of the first aperture and the aperture of the second aperture, the second coefficient array is determined in the first curve coefficient mapping table. It should be noted that since there is a certain functional relationship between the light spot size S and the aperture X 2 ′ of the second aperture, therefore, the column recording the aperture of the second aperture in the second curve coefficient mapping table described above can be replaced with the column data recording the light spot size.

[0098] In addition, since the power of the fundus light spot is not only related to the aperture X 2 ′ of the second aperture, but also related to the aperture X 1 ′ and position of the first aperture, therefore, when determining the second light spot power adjustment curve corresponding to the position of the first aperture, it is necessary to determine both the aperture X 2 ′ of the second aperture and the aperture X 1 ′ of the first aperture.

[0099] In step S603, the second light spot power adjustment curve is determined based on the second coefficient array. Exemplarily, assuming that the aperture X 2 ′ of the second aperture is 4 mm and the aperture X 1 ′ of the first aperture is 2 mm, then according to the second curve coefficient mapping table, the second light spot power adjustment curve can be determined as W′ = 0.0118D 3 -0.1156D 2+0.009D + 2.6095, where the only independent variable is the position of the first aperture stop, which is represented by the distance D between the first aperture stop and the light source.

[0100] Based on the embodiments described above in combination with Figure 1 those, a person skilled in the art can clearly understand that the present disclosure also provides a method for adjusting a fundus light spot, which is applied to an optical system for adjusting a fundus light spot. The structure of the optical system can refer to the embodiments described above in combination with Figure 1 those, which will not be elaborated here. The method includes the following steps: first, adjust the aperture of the second aperture-adjustable stop according to the target light spot size; then, determine the first light spot power adjustment curve according to the aperture of the second aperture-adjustable stop; and finally, adjust the aperture of the first aperture-adjustable stop according to the target light spot power and the first light spot power adjustment curve to form the target light spot.

[0101] It should be noted that the above steps have been described in detail in the embodiments described above in combination with Figure 2 those, which will not be elaborated here. It should be further noted that the method for adjusting the fundus light spot size described above in combination with Figure 4 those, and the method for determining the first light spot power adjustment curve described above in combination with Figure 5 those are also applicable to this embodiment.

[0102] Also based on the embodiments described above in combination with Figure 3 those, a person skilled in the art can clearly understand that the present disclosure also provides another method for adjusting a fundus light spot, which is also applied to an optical system for adjusting a fundus light spot. The structure of the optical system can refer to the embodiments described above in combination with Figure 3 those, which will not be elaborated here. The method includes the following steps: adjust the aperture of the second stop according to the target light spot size; then, determine the second light spot power adjustment curve according to the aperture of the second stop and the aperture of the first stop; and finally, adjust the position of the first stop according to the target light spot power and the second light spot power adjustment curve to form the target light spot.

[0103] It should be noted that the above steps have been described in detail in the embodiments described above in combination with Figure 3 those, which will not be elaborated here. It should be further noted that the method for adjusting the fundus light spot size described above in combination with Figure 4 those, and the method for determining the second light spot power adjustment curve described above in combination with Figure 6 those are also applicable to this embodiment.

[0104] In summary, some embodiments of the present disclosure provide an optical system for adjusting a fundus light spot. In this optical system, the adjustment controller can control the size of the fundus light spot by adjusting the aperture size of the second aperture-adjustable diaphragm, and at the same time, can extract a light spot power adjustment curve that matches the current scenario by means of the determined aperture of the second aperture-adjustable diaphragm. When the light spot power adjustment curve is uniquely determined, the power of the fundus light spot can be controlled by adjusting the aperture of the first aperture-adjustable diaphragm, so that the output light spot meets the requirements of the customized target light spot.

[0105] In addition, some embodiments of the present disclosure provide another optical system for adjusting a fundus light spot. In this optical system, the adjustment controller can control the size of the fundus light spot by adjusting the aperture size of the second aperture-adjustable diaphragm, and at the same time, can extract a light spot power adjustment curve that matches the current scenario by means of it. When the light spot power adjustment curve is uniquely determined, the power of the fundus light spot can be controlled by adjusting the position of the first diaphragm, meeting the customized requirements of the fundus light spot to adapt to different populations.

[0106] Based on any of the optical systems described in the foregoing embodiments, the present disclosure also provides two different methods for adjusting a fundus light spot. Both methods control the size of the fundus light spot by adjusting the aperture size of the second aperture-adjustable diaphragm / second diaphragm. One method controls the power of the fundus light spot by adjusting the aperture size of the first aperture-adjustable diaphragm, and the other method controls the power of the fundus light spot by adjusting the position of the first diaphragm.

[0107] Based on any of the optical systems described in the foregoing embodiments, another embodiment of the present disclosure provides an eye light therapy device. Figure 7 An exemplary structural diagram of the eye light therapy device 700 according to an embodiment of the present disclosure is shown. As Figure 7 shown, the eye light therapy device includes: a lens barrel 80 and the optical system in any of the foregoing embodiments, wherein the optical elements in the optical system are arranged in the lens barrel 80. For example, a light source 10, a first aperture-adjustable diaphragm 20, an illumination lens 30, a second aperture-adjustable diaphragm 40, and a projection lens 50. Another example is a light source, a first diaphragm, an illumination lens, a second diaphragm, and a projection lens. And, the light source of the optical system is arranged near one end of the lens barrel, and the other end of the lens barrel is flush with the rear focal plane of the projection lens.

[0108] In the eye light therapy device of this embodiment, the exit pupil plane of the illumination lens is optically conjugate to the fundus of the human eye. Therefore, the actual light source distribution seen by the human eye is the image of the light spot distribution on the exit pupil plane and is in a certain magnification ratio according to the focal length of the projection lens.

[0109] Exemplarily, the relationship between the light spot and the image in the eye illumination therapy device is as follows: Assume that the focal length of the illumination lens is f1 and the diameter is D1. Then, the formula for calculating the limit scattering half-angle θ1 that the illumination lens can receive from the light homogenizing plate is tanθ1 = D1 / (2*f1). The limit diameter of the exit pupil plane of the illumination lens is the same as the diameter of the illumination lens. The divergence half-angle θ1' of the exit pupil plane is related to the size d of the light source on the light homogenizing plate, and the relationship is tanθ1' = d / (2*f1). Assume that the focal length of the projection lens is f2 and the diameter is D2. Then, the diameter D of the light spot at the pupil 瞳孔 = 2*f2*tanθ1' = f2 / f1, which is the focal length ratio of the projection lens to the illumination lens. The divergence half-angle θ of the light spot at the pupil 瞳孔 is: tanθ 瞳孔 = D1 / (2*f2). Assume that the focal length of the human eye is f3. Then, the size D of the surface light source seen on the actual fundus of the human eye 眼底 is: D 眼底 = 2*f3*tanθ 瞳孔 = f3 / f2, which is the focal length ratio of the human eye to the projection lens. Generally, the focal length of the human eye is 17 mm.

[0110] Furthermore, in the eye illumination therapy device of this embodiment, a silicone gasket can also be provided at one end of the lens barrel 80 for fitting to the eye, so that when the user uses the eye illumination therapy device, the eye can be fitted on the silicone gasket, reducing the pressure of the lens barrel 80 on the eye and improving the use comfort of the eye illumination therapy device. Even further, the silicone gasket can also be replaced with other materials, such as sponge, etc.

[0111] Optionally, the present disclosure also provides a non-transitory machine-readable storage medium (or computer-readable storage medium, or machine-readable storage medium) storing computer program instructions (or computer programs, or computer instruction codes), which, when executed by a processor of an electronic device (or an electronic device, a server, etc.), cause the processor to execute some or all of the steps of the above method according to the present disclosure.

[0112] Although multiple embodiments of the present disclosure have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art can think of many changes, alterations, and alternative ways without departing from the spirit and scope of the present disclosure. It should be understood that various alternative solutions to the embodiments of the present disclosure described herein can be adopted in the practice of the present disclosure. The appended claims are intended to define the protection scope of the present disclosure and thus cover equivalents or alternative solutions within the scope of these claims.

Claims

1. An optical system for adjusting the fundus light spot, characterized in that, comprising: a light source, a first aperture-adjustable diaphragm, an illumination lens, a second aperture-adjustable diaphragm, a projection lens, and an adjustment controller, the light source, the first aperture-adjustable diaphragm, the illumination lens, the second aperture-adjustable diaphragm, and the projection lens are arranged in sequence along the optical path, the second aperture-adjustable diaphragm is closely attached to the illumination lens, and the exit pupil plane of the illumination lens is located at the front focal plane of the projection lens; wherein the adjustment controller is respectively connected to the first aperture-adjustable diaphragm and the second aperture-adjustable diaphragm, and is configured to: adjust the aperture of the second aperture-adjustable diaphragm according to the target light spot size; determine a first light spot power adjustment curve according to the aperture of the second aperture-adjustable diaphragm; and adjust the aperture of the first aperture-adjustable diaphragm according to the target light spot power and the first light spot power adjustment curve to form a target light spot.

2. The optical system according to claim 1, characterized in that, wherein adjusting the aperture of the second aperture-adjustable diaphragm according to the target light spot size includes: acquiring a preset light spot size adjustment curve or a light spot size mapping table; substituting the target light spot size into the preset light spot size adjustment curve or the light spot size mapping table to obtain the target aperture of the second aperture-adjustable diaphragm; and adjusting the second aperture-adjustable diaphragm according to the target aperture of the second aperture-adjustable diaphragm.

3. The optical system according to claim 1, characterized in that, wherein determining the first light spot power adjustment curve according to the aperture of the second aperture-adjustable diaphragm includes: invoking a first curve coefficient mapping table; determining a first coefficient array in the first curve coefficient mapping table according to the target light spot size or the aperture of the second aperture-adjustable diaphragm; and determining the first light spot power adjustment curve based on the first coefficient array.

4. The optical system according to claim 2, characterized in that, The preset spot size adjustment curve is S = -0.42X 2 + 3.0533, where S represents the spot size and X 2 represents the aperture of the second aperture adjustable diaphragm.

5. The optical system according to claim 3, characterized in that, the first aperture-adjustable diaphragm is closely attached to the light source, and the first curve coefficient mapping table is as follows: Among them, S represents the spot size, and X 2 represents the aperture of the second aperture adjustable diaphragm, [a1, a2, a3, a4, a5] is the first coefficient array, and a1 to a5 represent the polynomial coefficients in the first spot power adjustment curve W = a1X 1 4 + a2X 1 3 + a3X 1 2 + a4X 1 + a5, W represents the spot power, and X 1 represents the aperture of the first aperture adjustable diaphragm.

6. The optical system according to any one of claims 1-5, characterized in that, wherein both the first aperture-adjustable diaphragm and the second aperture-adjustable diaphragm include: a plurality of blades, which are centrosymmetrically distributed; a turntable, which drives the plurality of blades to move through a cam pair; and a drive motor, which is respectively connected to the turntable and the adjustment controller to drive the turntable to rotate under the control of the adjustment controller, so as to drive the plurality of blades to perform opening and closing actions through the cam pair.

7. An optical system for adjusting the fundus light spot, characterized in that, comprising: a light source, a first diaphragm, an illumination lens, a second diaphragm, a projection lens, and an adjustment controller, the light source, the first diaphragm, the illumination lens, the second diaphragm, and the projection lens are arranged in sequence along the optical path, the second diaphragm is an aperture-adjustable diaphragm and is closely attached to the illumination lens, and the exit pupil plane of the illumination lens is located at the front focal plane of the projection lens; The adjustment controller is respectively connected to the first diaphragm and the second diaphragm, and is configured to: Adjust the aperture of the second diaphragm according to the target spot size; Determine a second spot power adjustment curve according to the aperture of the second diaphragm and the aperture of the first diaphragm; And Adjust the position of the first diaphragm according to the target spot power and the second spot power adjustment curve to form a target spot.

8. The optical system according to claim 7, wherein, Adjusting the position of the first diaphragm according to the target spot power and the second spot power adjustment curve includes: Adjusting the distance between the first diaphragm and the light source according to the target spot power and the second spot power adjustment curve.

9. The optical system according to claim 7 or 8, wherein, Determining a second spot power adjustment curve according to the aperture of the second diaphragm and the aperture of the first diaphragm includes: Invoking a second curve coefficient mapping table; Determining a second coefficient array in the first curve coefficient mapping table according to the aperture of the first diaphragm and the aperture of the second diaphragm; and Determining the second spot power adjustment curve based on the second coefficient array.

10. The optical system according to claim 9, wherein, The second curve coefficient mapping table is as follows: Among them, X 1 ' represents the aperture of the first diaphragm, and X 2 ' represents the aperture of the second diaphragm. [b1, b2, b3, b4] represents the second coefficient array, and b1 to b4 respectively represent the polynomial coefficients in the second spot power adjustment curve W' = b1D 3 + b2D 2 + b3D + b4, where W' represents the spot power and D represents the distance between the first diaphragm and the light source.

11. The optical system according to claim 7, wherein, Adjusting the aperture of the second diaphragm according to the target spot size includes: Obtaining a preset spot size adjustment curve or a spot size mapping table; Substituting the target spot size into the preset spot size adjustment curve or the spot size mapping table to obtain the target aperture of the second diaphragm; and Adjusting the second diaphragm according to the target aperture of the second diaphragm.

12. The optical system according to claim 11, wherein, The preset spot size adjustment curve is S = -0.42X 2 '+ 3.0533, where S represents the spot size and X 2 ' represents the aperture of the second diaphragm.

13. The optical system according to claim 7, wherein, The first diaphragm is a diaphragm with adjustable aperture, and the adjustment controller is further configured to: Adjust the aperture of the first diaphragm to adjust the spot power.

14. A method for adjusting a fundus spot, wherein, The method is applied to an optical system for adjusting a fundus spot, the optical system includes: a light source, a first aperture-adjustable diaphragm, an illumination lens, a second aperture-adjustable diaphragm, a projection lens and an adjustment controller, the light source, the first aperture-adjustable diaphragm, the illumination lens, the second aperture-adjustable diaphragm and the projection lens are arranged in sequence along the optical path, the second aperture-adjustable diaphragm is closely attached to the illumination lens, and the exit pupil plane of the illumination lens is located at the front focal plane of the projection lens; The method includes: Adjusting the aperture of the second aperture-adjustable diaphragm according to the target spot size; Determining a first spot power adjustment curve according to the aperture of the second aperture-adjustable diaphragm; and Adjusting the aperture of the first aperture-adjustable diaphragm according to the target spot power and the first spot power adjustment curve to form a target spot.

15. A method for adjusting a fundus spot, wherein, The method is applied to an optical system for adjusting a fundus light spot. The optical system includes: a light source, a first aperture stop, an illumination lens, a second aperture stop, a projection lens, and an adjustment controller. The light source, the first aperture stop, the illumination lens, the second aperture stop, and the projection lens are arranged in sequence along the optical path. The second aperture stop is an aperture-adjustable stop and is closely attached to the illumination lens. The exit pupil plane of the illumination lens is located at the front focal plane of the projection lens; The method includes: Adjusting the aperture of the second aperture stop according to the target light spot size; Determining a second light spot power adjustment curve according to the aperture of the second aperture stop and the aperture of the first aperture stop; and Adjusting the position of the first aperture stop according to the target light spot power and the second light spot power adjustment curve to form a target light spot.

16. An eye light therapy device, characterized in that, it includes: a lens barrel and the optical system according to any one of claims 1-6. The light source, the first aperture-adjustable stop, the illumination lens, the second aperture-adjustable stop, and the projection lens in the optical system are arranged in the lens barrel, and the light source is arranged near one end of the lens barrel. The other end of the lens barrel is flush with the rear focal plane of the projection lens and is used to fit closely to the eye during use; Or, the eye light therapy device includes: a lens barrel and the optical system according to any one of claims 7-13. The light source, the first aperture stop, the illumination lens, the second aperture stop, and the projection lens in the optical system are arranged in the lens barrel, and the light source is arranged near one end of the lens barrel. The other end of the lens barrel is flush with the rear focal plane of the projection lens and is used to fit closely to the eye during use.

Images