A near-corneal annular tilted multi-angle lighting device

Abstract

A near-corneal annular, tilted, multi-angle lighting device comprises an optical system. A ring-shaped, tilted, multi-angle lighting device is positioned near the eye between the optical system and the eye. The illumination light emitted by the annular, tilted, multi-angle lighting device forms an angle with the imaging optical axis of the optical system. The light emitted by the tilted lighting device is used to observe the corneal surface and corneal surface attachments (tear layer, tear surface lipid layer), etc. Used in ocular surface examination optical systems (such as ophthalmic slit lamps, corneal topography, keratometers, etc.), the device's illumination light substantially covers the corneal surface. To improve the signal-to-noise ratio and reduce noise, the device utilizes light tilted from the imaging optical axis of the optical system. To enhance the signal, the device is positioned near the eye. To reduce the circular signal dark zone in the central cornea and meet the requirement for decreasing illumination angles from the center of the cornea to the periphery, a ring-shaped lighting body with a convex inner surface of a horn structure is employed.

Description

Technical Field

[0001] The present invention relates to the field of medical special equipment, and in particular to a near-corneal annular tilted multi-angle lighting device. Background Art

[0002] The cornea is located on the surface of the eyeball. It is transparent and in direct contact with the outside world, making it susceptible to damage and infection. Observation of the corneal surface is mainly carried out using a slit lamp microscope, an ophthalmoscope, a corneal topography map, a keratometer, etc. When observing the cornea with a slit lamp microscope, the cornea can only be sectioned through a narrow slit of light to observe its cross-section. To examine the corneal surface with a slit lamp, the transparent corneal surface needs to be stained. The corneal surface is intervened by a dyeing medium, and color will appear at the site of damage or ulceration. However, it will also mask other information on the corneal surface itself (such as information on tears, tear film, and the lipid layer on the tear film), and transparent attachments on the corneal surface (such as the tear film and the lipid layer on the tear film) cannot be observed. If corneal staining is not performed, when observing the corneal surface and surface attachments (such as the tear film and the lipid layer on the tear film), the optical signal will be interfered with by the reflected light noise from the iris, pupil and other non-observable tissues behind the cornea. Since the cornea and its surface attachments (such as the tear film and the lipid layer on the tear film) are transparent, these interference noises are much stronger than the optical signal on the corneal surface (i.e., the signal-to-noise ratio is extremely low), and the cornea and its surface attachments (such as the tear film and the lipid layer on the tear film) cannot be observed at all. In order to solve this problem, it is necessary to suppress interference and increase signal strength to achieve the purpose of effectively observing the crops attached to the corneal surface. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the present invention proposes a near-corneal annular tilted multi-angle lighting device. The specific technical solution is as follows:

[0004] A near-corneal annular tilted multi-angle lighting device includes an optical system and is characterized in that an annular tilted multi-angle lighting device is arranged between the optical system and the eye, near the eye, and there is an angle between the illumination light emitted by the annular tilted multi-angle lighting device and the imaging optical axis of the optical system. The light emitted by the annular tilted lighting device is used to observe the corneal surface and objects attached to the corneal surface.

[0005] Furthermore, the lighting device includes an outer cover, an annular lighting body and an illumination light source are arranged inside the outer cover, and a light passage is opened in the annular lighting body along the axial direction.

[0006] Furthermore: the annular lighting body includes an inner surface of a horn structure, the large end of the inner surface of the horn structure is close to the direction of the eyes, and an illumination light source is arranged inside the annular lighting body. The light emitted by the illumination light source is uniformly illuminated through the inner surface of the horn structure in an inclined multi-angle illumination manner to illuminate the corneal surface of the eye, and the shape of the inner surface of the horn structure is convex.

[0007] Furthermore: the annular lighting body is made of a transparent material or a translucent material.

[0008] The beneficial effects of the present invention are as follows: it is used in an ocular surface examination optical system (such as an ophthalmic slit lamp, corneal topography, keratometer, etc.) to illuminate the corneal surface of the eye and observe the corneal surface and the objects attached to the corneal surface. In order to improve the signal-to-noise ratio and reduce noise, light that is tilted to the imaging optical axis of the optical system is used for illumination; in order to enhance the signal, the device is placed close to the eye; in order to reduce the circular signal dark area in the central area of ​​the cornea and meet the requirements of the illumination angle from the center of the cornea to the peripheral area from large to small, a ring-shaped lighting body on the convex inner surface of the horn structure is used. The tilted multi-angle lighting device provides sufficient illumination light to the corneal surface, reduces the signal dark area, uses low power, is small in size, and provides a clear and distinct illuminated image of the objects attached to the corneal surface.

[0009] First, to reduce noise, the lighting device uses multi-angle oblique lighting. For the iris behind the cornea, oblique multi-angle lighting reduces the energy per unit area of ​​light received by the iris. At the same time, the large incident angle leads to a large reflection angle, which prevents the reflected light from entering the optical system imaging light path.

[0010] Second, to enhance the signal, near-corneal lighting is used. The attenuation of the lighting effect produced by the oblique lighting on the iris will not occur on the cornea. The reason is that the cornea is a hemispherical structure. Since the lighting source is closer to the cornea than the existing corneal lighting devices (such as corneal topography), the distance is shortened exponentially (for example, from more than 100mm for corneal topography to about 20-30mm). Therefore, under the condition of the same lighting power, the lighting effect is greatly improved. In this way, the crops attached to the corneal surface (tear film and the lipid layer on the tear film) can be better observed (the device is placed in front of the slit lamp).

[0011] Third, a light-through hole is provided axially inside the annular lighting body, resulting in a circular signal dark area in the center of the cornea that is not illuminated by the illumination light. Our goal for corneal illumination is to reduce this signal dark area so that the cornea has a good signal-to-noise ratio from the center to the peripheral area. Through experiments, it was found that in order to reduce the signal dark area in the center of the cornea, the illumination tilt angle (the angle between the illumination light and the imaging optical axis of the optical system) should be large; in order to have a good signal in the peripheral area of ​​the cornea, the illumination tilt angle should be small; and from the center of the cornea to the peripheral area, the illumination tilt angle should also change from large to small. Therefore, a multi-angle illumination with tilted illumination light was invented, in which the inner surface of the annular lighting body was made into a trumpet-shaped convex structure to meet the demand for illumination angles from large to small from the center of the cornea to the peripheral area.

[0012] In short, the annular tilted multi-angle illumination near the cornea is to improve the optical signal-to-noise ratio, reduce the circular signal dark area in the central area of ​​the cornea, and clearly observe the image information of the corneal surface and corneal surface attachments (such as the tear film and the lipid layer on the tear film) through the optical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the overall structural diagram of the present invention;

[0014] The reference numerals in the figure are as follows: outer cover 1 , connecting member 2 , eye 3 , annular lighting body 4 , lighting source 5 , and optical system 6 . DETAILED DESCRIPTION

[0015] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0016] A near-corneal annular tilted multi-angle lighting device acts on the ocular surface inspection optical system 6. In this embodiment, the specific form of the ocular surface inspection optical system 6 can be, for example, an ophthalmic slit lamp, a corneal topography, a keratometer, etc., which are collectively referred to as the optical system below. An annular tilted multi-angle lighting device is arranged between the optical system 6 and the eye 3 near the eye position. There is an angle between the illumination light emitted by the annular tilted multi-angle lighting device and the imaging optical axis of the optical system 6. The light emitted by the tilted multi-angle lighting device is used to observe the corneal surface, crops attached to the corneal surface, etc. The crops attached to the corneal surface include the tear layer and the lipid layer on the tear surface.

[0017] The tilted multi-angle lighting device in this embodiment adopts a specific structure as follows: Figure 1 As shown, the lighting device includes a housing 1 and a connector 2. The housing 1 is connected to an optical system 6 via the connector. An annular lighting body 4 and an illumination light source 5 are disposed within the housing 1. The annular lighting body 4 has a light passage axially defined therein. The optical system 6 observes the corneal surface through the light passage.

[0018] Among them, the annular lighting body contains an inner surface of a horn structure, the large end of the inner surface of the horn structure is close to the direction of the eyes, and an illumination light source is arranged inside the annular lighting body. The light emitted by the illumination light source passes through the inner surface of the horn structure in an inclined multi-angle illumination manner to uniformly illuminate the corneal surface of the eye, and the shape of the inner surface of the horn structure is convex.

[0019] During use of the present invention, the annular oblique lighting device can be used alone or in combination with other structures, and can be moved out of the light path of the optical system 6 as a whole when not in use.

Claims

1. A near-corneal annular tilted multi-angle lighting device, comprising an optical system, characterized in that: An annular, tilted, multi-angle lighting device is provided between the optical system and the eye, near the eye. The illumination light emitted by the annular, tilted, multi-angle lighting device forms an angle with the imaging optical axis of the optical system. The light emitted by the annular, tilted lighting device is used to observe the corneal surface and objects attached to the corneal surface. The lighting device comprises an outer cover, an annular lighting body and an illumination light source are arranged in the outer cover, and a light passage is opened in the annular lighting body along the axial direction; The annular lighting body includes an inner surface of a horn structure, the large end of the inner surface of the horn structure is close to the direction of the eyes, and an illumination light source is arranged inside the annular lighting body. The light emitted by the illumination light source is uniformly illuminated by the inner surface of the horn structure in an inclined multi-angle illumination manner on the corneal surface of the eye, and the shape of the inner surface of the horn structure is convex; The annular lighting body is made of transparent material or translucent material.

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