Lens element
By designing the first and second optical elements in the lens element, the focus shift in the peripheral area of the retina and the clear vision in the central area are corrected, which solves the problem that the existing technology cannot suppress or slow down the development of refractive abnormalities, and achieves effective myopia or hyperopia control and vision optimization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ESSILOR INTERNATIONAL(COMPAGNIE GENERALE D OPTIQUE)
- Filing Date
- 2023-03-27
- Publication Date
- 2026-05-01
AI Technical Summary
Existing technologies cannot effectively inhibit or slow down the development of refractive errors in the eye when correcting myopia or hyperopia, especially under near vision conditions. In particular, when children use smartphones, images of nearby objects are formed behind the retina, which leads to the aggravation of myopia.
Design a lens element comprising first and second sets of optical elements, which respectively provide first and second optical functions, thereby achieving defocus correction in the peripheral retinal area and clear vision correction in the central retinal area by forming a focal shift in the peripheral retinal area and a reaction focal shift in the central retinal area.
By correcting defocus in the peripheral retina and clear vision in the central retina, it effectively controls the development of myopia or hyperopia, slows down the progression of myopia, and provides efficient myopia or hyperopia control and optimized vision correction.
Smart Images

Figure CN116804802B_ABST
Abstract
Description
Lens Components Technical Field
[0001] This disclosure relates to a lens element designed to be worn in front of a human eye to specifically inhibit, reduce, or control the development of refractive errors such as myopia or hyperopia. The lens element is particularly an ophthalmic product.
[0002] The term "ophthalmic products" is specifically understood to mean corrective lenses or other lenses that can be used as, for example, eyeglasses, especially sunglasses, goggles, shields, etc., or contact lenses that are worn by a user and come into direct contact with their eyes. Background Technology
[0003] Myopia (nearsightedness) is characterized by the eye focusing in front of its retina. Hyperopia (farsightedness) is characterized by the eye focusing behind its retina. Myopia is typically corrected with concave lenses, while hyperopia is typically corrected with convex lenses.
[0004] It has been observed that some individuals, particularly children, experience inaccurate focusing when using conventional single-vision lenses to correct their vision, especially when viewing objects at close range (i.e., under near vision conditions). This is especially true now that children are exposed to and use smartphones from a young age. Because of this focusing defect in some children with myopia who are corrected for distance vision, images of nearby objects are formed behind the retina (even in the fovea region).
[0005] This focusing deficit may affect the development of myopia in these individuals. It can be observed that, for most of the individuals mentioned, the myopia deficit tends to worsen over time.
[0006] Foveal vision corresponds to the visual state of an object being viewed, which is formed by the eye in the central area of the retina called the fovea.
[0007] Peripheral vision corresponds to the perception of scene elements that are laterally offset relative to the object being viewed, the images of which are formed on the peripheral portion of the retina, away from the fovea.
[0008] The ophthalmic correction provided to a subject with refractive errors is usually appropriate for their foveal visual acuity. However, it is well known that peripheral vision must be reduced relative to the correction determined for foveal visual acuity. In particular, studies on monkeys have shown that focusing light far to the periphery of the retina causes the eye to elongate and thus exacerbates myopia, even when the light is simultaneously focused perfectly on the fovea.
[0009] Therefore, there seems to be a need for a lens element that can suppress, control, or at least slow down the development of refractive abnormalities in the eye, such as myopia or hyperopia.
[0010] WO 2019206569, in the name of the applicant, proposes a solution by disclosing a lens element having an optical element that specifically exhibits a focus shift that enables the image to not be focused on the periphery of the retina under standard wearing conditions.
[0011] This disclosure aims to provide improved functionality, at least in some cases, particularly depending on the gaze direction. Summary of the Invention
[0012] To achieve this objective, this disclosure proposes a lens element intended to be worn in front of a wearer's eye, the lens element comprising at least a first set of optical elements and a second set of optical elements respectively providing a first optical function and a second optical function.
[0013] - Specifically, when worn by the wearer, the first set of optical elements is located further from the center of eye rotation than the second set of optical elements.
[0014] - At least some of the optical elements in the first group and the second group are arranged in a mutually related manner such that, for at least one viewing direction, a first cumulative optical effect and a second cumulative optical effect are simultaneously provided for corresponding at least a first incident beam and a second incident beam:
[0015] - A first optical accumulation effect is provided to cause the first incident beam to illuminate the peripheral area of the wearer's retina and includes the effect of focus shift;
[0016] - The second optical cumulative effect is provided for illuminating the central area of the wearer's retina with the second set of optical elements and includes the effect of reacting with the focus shift caused by the first optical function of the first set of optical elements, at least partially or completely, through the second set of optical elements.
[0017] This simultaneous first and second cumulative effect allows for efficient control of myopia or hyperopia and optimized visual correction of the central retina by defocusing in the peripheral retinal area.
[0018] The first cumulative effect allows for the formation of a blurred / defocused image in the peripheral area of the wearer's retina. The focal point of the lens element is shifted upwards to be located upstream of the retina and closer to the back / rear side of the lens element.
[0019] The second cumulative effect allows for the formation of an image with improved clarity in the fovea of the wearer's retina.
[0020] Depending on whether the lens element or the method described above is used alone or in combination, there are other aspects related to this:
[0021] A gaze direction is, for example, between + / - 10°.
[0022] Another gaze direction can be between -40° and -20°.
[0023] Lens elements may include, for example, an anterior refractive region and a posterior refractive region that cooperate to achieve refractive power based on a prescription for the wearer's eyes.
[0024] The first set of optical elements is, for example, positioned in front of the lens element.
[0025] The second set of optical elements is, for example, positioned behind the lens element.
[0026] In other embodiments, the first set of optical elements or the second set of optical elements, or both, can be integrated into the intermediate layer of the lens element.
[0027] The first set of optical elements can be recessed or protruded relative to the pre-refractive region.
[0028] The second set of optical elements can be recessed or protruded relative to the refractive region.
[0029] The second set of optical elements can be at least partially ring-shaped.
[0030] At least some of the optical elements in the second group are configured to change the gradient law of the associated first group of optical elements according to the lens eccentricity.
[0031] The present invention also relates to a method for conceiving the above-mentioned lens elements intended for wear by a wearer, wherein the position of a second set of optical elements is determined relative to the rotation center of the wearer's eye. Attached Figure Description
[0032] Other advantages and features will become apparent after reading the description of the following figures, which are shown in the figures:
[0033] - Figure 1 is a schematic simplified cross-sectional view of a lens element according to the present disclosure;
[0034] Figures 2 and 3 schematically illustrate the optical system of the eye and lens elements; and
[0035] Figures 4 and 5 are schematic diagrams of a possible experimental setup that allows for the examination of the cumulative effect of the optical elements of a lens element. Detailed Implementation
[0036] In all the accompanying drawings, the same elements are labeled with the same reference numerals.
[0037] The following embodiments are merely examples. Although this specification relates to one or more embodiments, the invention is not limited to that embodiment. Furthermore, features described in relation to one embodiment may also relate to another embodiment, even if not explicitly mentioned. Simple features of different embodiments may also be combined to provide other implementations.
[0038] In this specification, the terms "front" or "rear" of a layer, lens element, or surface refer to the propagation of light toward the eye through the lens when the ophthalmic device carrying the lens is worn on the wearer's face. Therefore, the "front" surface is always the surface furthest from the user's eye and thus closest to the field of vision, while the "rear" surface is always the surface closest to the user's eye.
[0039] The terms "upstream" or "downstream" are used in relation to the propagation of light from the outside of the eye through the lens element worn by the wearer, the wearer's pupil, and toward the retina of their eye. Thus, when light passes through a first object (surface, layer, image, etc.) and then through a second object toward the wearer's retina, the first object is upstream of the second object.
[0040] For example, when the image is located in front of the retina and between the pupil and the retina, the image is located upstream or in front of the wearer's retina.
[0041] Conversely, as light first passes through the second element and then through the first element toward the wearer's retina, the first object is located "downstream" of the second object. Therefore, the wearer's retina is downstream of the lens element and the wearer's pupil.
[0042] The cumulative effect of focus shift is understood as follows: when compared to a lens element that is identical but does not have an optical element, the optical element causes, for at least some light beams, a focus shift / reshaping of the entire lens element upstream of the wearer's retina and closer to / near the back of the lens element. This focus shift upstream of the retina causes the image to be out of focus / blurred in the area of interest. The cumulative effect of reaction focus shift is understood as follows: the optical element in one set of optical elements causes, for at least some light beams, a focus shift / reshaping of the entire lens element to cancel / reverse the focus shift caused by another set of optical elements.
[0043] This disclosure relates to a lens element intended to be worn in front of a wearer's eye.
[0044] In the context of this disclosure, the term "lens element" can refer to a lens blank, an uncut optical lens, an eyeglass optical lens that has been edged to fit a particular eyeglass frame, an ophthalmic lens, or a contact lens.
[0045] Figure 1 shows a simplified cross-sectional view of an example of a lens element 10 having a front 10F and a rear 10R according to the present disclosure, the lens element being designed to be worn in front of the wearer's eyes.
[0046] The lens element 10 includes a substrate 11 having an anterior refractive region 12F and a posterior refractive region 12R. Both the refractive regions 12F and 12R have refractive power based on the prescription for the wearer's eyes.
[0047] The purpose of the refractive power of the refractive zones 12F and 12R, based on the wearer's eye prescription, is to form a clear or (compared to) at least a clearer image on the wearer's retina. A parallel incident beam of light will be focused on the retina, and also on the fovea and peripheral areas of the retina.
[0048] The lens element 10 further includes a first set of optical elements 14F on its front 10F and a second set of optical elements 14R on its rear 10R, the first set of optical elements and the second set of optical elements providing a first optical function and a second optical function, respectively.
[0049] Optical elements 14F and 14R are located, for example, on at least a portion of the corresponding refractive regions 12F and 12R.
[0050] In other embodiments, the first set of optical elements 14F and / or the second set of optical elements 14R may be embedded or integrated in one layer of a multilayer substrate (e.g., in the case where the substrate comprises several layers).
[0051] The first set of optical elements 14F or the second set of optical elements 14R may be part of a specific optical layer of the substrate 11.
[0052] In the context of this disclosure, optical element 14F / or 14R can be considered as an optical structure that provides wavefront modification of light relative to the anterior refractive region 12F and / or the posterior refractive region 12R in terms of intensity, curvature, or optical deviation. The physical extension Z (deformation / height) of such optical element 14F or 14R can particularly be between [0, 1 μm - 50 μm]. In terms of physical extension X / Y (width / length / diameter), it can be between [0.5 μm, 2.5 mm] in at least one direction. Optical element 14F or 14R can have a (recessed or protruding) droplet shape, or a ring or annular shape. In the case of a ring or annular optical element 14F or 14R, the cross-section of the ring can be between [0.5 μm, 2.5 mm].
[0053] The hard coating can protect the lens element 10 and cover the optical elements 14F and / or 14R and the refractive areas 12F and / or 12R.
[0054] Optical elements 14F and / or 14R may or may not be absorptive. When the optical element is absorptive, its absorptive capacity can reach 100% locally.
[0055] Optical elements 14F / or 14R can also be configured to scatter or diffract light, particularly with scattering or diffracting angles in the range of + / -1° to + / -30°.
[0056] The substrate 11 is made of, for example, a plastic material (e.g., a polymer substrate), such as a thermosetting material, particularly made of poly(urea-urethane), or a thermoplastic material, particularly made of polyamide (PA) (e.g., nylon, polycarbonate, or polyester).
[0057] The first set of optical elements and / or the second set of optical elements 14F / 14R can be made of the same material as the substrate 11 and therefore have the same refractive index.
[0058] In other examples, particularly when embedded, the first set of optical elements and / or the second set of 14F / 14R can be made of different materials with a refractive index different from that of the refractive material forming the substrate 11.
[0059] In the example of Figure 1, the first set of optical elements 14F protrudes from the front 10F, for example, and can be considered as multiple independent island-like regions. The second set of optical elements 14R is recessed from the rear 10R, for example. This optical element can also be considered as multiple independent island-like regions.
[0060] In other examples not shown, the first set of optical elements 14F and / or the second set of optical elements 14R may be
[0061] - Ring or circular shape
[0062] - Protruding or recessed,
[0063] - Continuous or discontinuous.
[0064] The refractive regions 12F and 12R are preferably formed as regions other than those formed by the plurality of first optical elements 14F and second optical elements 14R. In other words, the refractive regions 12F and 12R are regions complementary to the regions occupied by the plurality of first optical elements 14F and second optical elements 14R.
[0065] Refractive zones 12F and 12R are configured to provide the wearer with a first optical power based on a prescription for correcting refractive errors in the wearer's eye, under standard wearing conditions, particularly for foveal visual acuity. The purpose of refractive zones 12F and 12R is to focus parallel incident light onto the retina.
[0066] Wearing conditions are understood as the position of the lens element 10 relative to the wearer's eyes, such as by the anterior tilt angle, the distance from the cornea to the lens, the distance from the pupil to the cornea, and the distance from the eye rotation center Q' to the pupil.
[0067] As will be explained in more detail below relative to FIG3, at least some of the optical elements in the first set of optical elements 14F and the second set of optical elements 14R are arranged in such a way that, for at least one viewing direction, a first cumulative optical effect and a second cumulative optical effect are provided simultaneously for the corresponding at least first incident beam and second incident beam.
[0068] The first optical cumulative effect is provided to cause the first incident beam to illuminate the peripheral area of the wearer's retina and includes a focus shift, meaning that for a parallel incident beam, the focus is shifted / moved away from the retina along the direction of the pupil. Therefore, the focus shift causes the image to not be focused on the peripheral area of the wearer's retina, thereby allowing myopia and hyperopia to be controlled. Thus, the focus is located in front of or upstream of the wearer's retina.
[0069] The second optical accumulation effect is provided to direct the second incident beam onto the central area of the wearer's retina and includes a counter-focus shifting effect, at least partially or completely, of the focus shift caused by the first optical function of the first optical element 14F via the second set of optical elements 14R. Therefore, for example, by completely countering the focus shift caused by the first optical function (i.e., canceling or reversing the focus shift caused by the first set of optical elements), the image will be focused on the retina. Thus, the second set of optical elements 14R reverses the first optical function of the optical element 14F of the first set of optical elements for the second incident beam.
[0070] In particular, in relation to this second cumulative effect, at least some of the optical elements of the second set of optical elements 14R can be configured to change the gradient law of the associated first set of optical elements 14F according to the lens eccentricity.
[0071] Therefore, at least in one gaze direction, but preferably in some range of gaze directions, the wearer will benefit from optimized visual correction of the central area of the retina and at the same time from efficient myopia or hyperopia control by defocusing in the peripheral area of the retina.
[0072] Independent optical functions are achieved for other beams that pass only through the first set of optical elements 14F or the second set of optical elements 14R.
[0073] The independent first optical function and second optical function of the first group of optical elements 14F and the second group of optical elements 14R may be the same or different.
[0074] The independent first and second optical functions of the first set of optical elements 14F and / or the second set of optical elements 14R may also be focal shifts that cause the image to be at least partially defocused / blurred on the retina of the wearer's eye, thereby producing unfocused light, for example, in front of the retina, particularly in the peripheral area of the retina, in order to slow myopia.
[0075] Other independent optical functions, by way of non-limiting enumeration, may include specific local power correction, astigmatism correction, aspherization, or prisms to selectively direct light rays.
[0076] Turning now to Figures 2 and 3, which are diagrams of the optical system of the eye and lens element 10, the definitions used in this disclosure are shown.
[0077] For clarity, only dashed outlines are used to represent some optical elements of the first group of optical elements 14F located on the front 10F, and only solid outlines are used to represent some optical elements of the second group of optical elements 14R located on the rear 10R. The same applies to Figure 3, which only shows some optical elements of the first group of optical elements 14F and some optical elements of the second group of optical elements 14R.
[0078] More precisely, Figure 2 shows a three-dimensional view of this system, illustrating the parameters α and β used to define the gaze direction. Figure 3 is a vertical plane view parallel to the anterior-posterior axis of the wearer's head, which passes through the center of rotation of the eye when parameter β equals 0.
[0079] The center of rotation of the eye is marked Q'. The axis Q'F', shown as a dashed line in Figure 3, is a horizontal axis passing through the center of rotation of the eye and extending in front of the wearer; that is, it corresponds to the axis Q'F' of the primary gaze angle. This axis cuts through the aspherical surface of the lens at a point known as the fitting cross, which exists on the lens to allow the optician to position the lens in the frame. The intersection of the rear surface of the lens with axis Q'F' is point O. If O is located on the rear 10R, it can be the fitting cross.
[0080] The apex ball, with center Q' and radius q', is tangent to the rear 10R of lens element 10 at a point on the horizontal axis. As an example, a radius q' of 25.5 mm corresponds to a commonly used value and provides satisfactory results when wearing the lens.
[0081] A given gaze direction (represented by the solid line in Figure 2) corresponds to the position of the eye rotating around Q' and the point J of the crown of the eye; angle β is the angle formed between the axis Q'F' and the projection of the line Q'J onto the horizontal plane including the axis Q'F'; this angle appears in the schematic diagram of Figure 2. Angle α is the angle formed between the axis Q'J and the projection of the line Q'J onto the horizontal plane including the axis Q'F'; this angle appears in the schematic diagrams of Figures 2 and 3. Therefore, a given gaze direction corresponds to the point J of the crown of the eye or to a pair (α, β). The larger the value of the gaze reduction angle in the positive direction, the greater the gaze reduction; conversely, the larger the value in the negative direction, the greater the gaze elevation.
[0082] In a given gaze direction, the image of point M located at a given object distance in object space is formed between two points S and T corresponding to a minimum distance JS and a maximum distance JT, which will be the sagittal local focal length and the tangential local focal length, respectively. An image of a point at infinity in object space is formed at point F'. Distance D corresponds to the posterior coronal plane of the lens.
[0083] Typically, in far vision following the dominant gaze direction, the object point is at infinity. In near vision following a gaze direction that substantially corresponds to an angle α of approximately 35° and an angle β of approximately 5° toward the nose, the object distance is approximately 30 cm to 50 cm.
[0084] With this explanation, it can be clearly understood from Figure 3 that when worn by the wearer, the first set of optical elements 14F is set at a distance of a first range relative to the rotation center Q' of the eye, and the second set of optical elements 14R is set at a distance of a second range relative to the rotation center Q' of the eye, which is different from the first range distance. In particular, as shown in Figure 3, the distance of the first range is farther from the rotation center Q' of the eye than the distance of the second range.
[0085] In other words, for the same gaze direction, the first set of optical elements 14F is located further from the eye's rotation center Q' than the second set of optical elements 14R.
[0086] Furthermore, as shown in the example of Figure 3, for a certain gaze direction, the first beam L1 (double-dotted line) and the second beam L2, which is traced from the image point M, first cross the first set of optical elements 14F and then cross the second set of optical elements 14R.
[0087] However, the cumulative effect produced on the first beam L1 and the second beam L2 is different.
[0088] In fact, the first optical accumulation effect is provided to cause the first incident beam L1 to illuminate the peripheral area of the wearer's retina and includes the function of producing a focus shift in the peripheral area of the wearer's retina.
[0089] The light beam L1 passes through optical elements 14F and 14R eccentrically and illuminates the peripheral area of the wearer's retina. In this case, the light beam L1 is not focused on the retina, but rather upstream of it, because the cumulative wavefront modification of the light beam L1 caused by optical elements 14F and 14R is different from the cumulative wavefront modification of the light beam caused by the continuous refractive brightness of the refractive areas 12F and 12R.
[0090] The second optical cumulative effect is provided for illuminating the central area of the wearer's retina with the second incident beam L2 and includes the effect of counteracting the focus shift caused by the first optical function of the first set of optical elements 14F, at least partially or completely, through the second set of optical elements 14R.
[0091] Therefore, the second cumulative effect allows for the formation of an image with improved clarity in the fovea of the wearer's retina.
[0092] The light beam L2 passes through the center of optical elements 14F and 14R and illuminates the central area of the wearer's retina. In this case, the light beam L2 is at least partially or completely focused on the retina because the cumulative wavefront modification of the light beam L2 caused by optical elements 14F and 14R is equivalent to the cumulative wavefront modification of the light beam caused by the continuous refractive brightness of the refractive regions 12F and 12R.
[0093] Therefore, at least in one gaze direction, but preferably in some range of gaze directions, the wearer will benefit from optimized visual correction of the central area of the retina and at the same time from efficient myopia or hyperopia control by defocusing in the peripheral area of the retina.
[0094] Preferred fixation directions include, for example, fixation angles between + / -10° for distance vision and / or between -40° and -20° for near vision (as depicted in Figure 3).
[0095] The lens element 10 shown in the attached figure can be manufactured in various ways, particularly by molding and / or machining and polishing the substrate 11 or the lens blank.
[0096] To achieve a personalized configuration for the wearer, eye geometry (e.g., eye rotation center, pupil position, and retinal shape) is measured. For example, taking into account the specificity of the wearer's eye, for a lens blank that cooperates with the anterior refractive region 12F and the posterior refractive region 12R to achieve a refractive power based on the prescription for the wearer's eye and presents optical element 14F, the position of the second set of optical elements 14R can be determined in a personalized manner, for example, by using a ray tracing method, relative to the rotation center Q' of the wearer's eye, so as to achieve the first and second cumulative effects described above at least in one gaze direction or in some gaze directions.
[0097] Figures 4 and 5 illustrate a schematic experimental setup that allows for the arrangement of a first set of optical elements 14F and a second set of optical elements 14R relative to each other for certain gaze directions (e.g., for near vision in Figure 5) to provide the aforementioned cumulative first and second optical functions.
[0098] In addition to the lens element 10 described above, Figures 4 and 5 also show a rotatable camera 50.
[0099] The camera's aperture is positioned similarly to the pupil of an eye: the distance between the back surface of the lens and the aperture is close to the desired distance, for example, an average distance of 14mm.
[0100] The camera 50 can rotate, and the rotation center 51 of the camera should be similar to the rotation center Q' of the eye.
[0101] For example, the distance between the rotation center and the rear surface of the lens is close to 27 mm (average distance), or the distance between the aperture and the rotation center is close to 13 mm.
[0102] The reference (0°) viewing direction is defined as the angular position of camera 50 when the camera optical axis 53 passes through the optical center 55 of the lens.
[0103] Other gaze directions are limited by this reference, with the horizontal / vertical direction taken as the horizontal / vertical rotation angle from this reference.
[0104] Lens element 10 is positioned such that camera 50 adopts the reference viewing or gaze direction. Lens element 10 has a desired tilt angle 56 and wrap angle, as it would when mounted on an eyepiece. Taking averages, the tilt angle can be approximately 10° and the wrap angle approximately 5° (average).
[0105] With the lens element 10 and camera 50 already positioned accordingly, the optical elements 14F and 14R can cooperate in certain viewing directions to simultaneously achieve the accumulation of the first and second optical functions in the following ways:
[0106] - Select at least one gaze direction by rotating the camera 50 (as shown in Figure 5).
[0107] - Capture images from camera 50.
[0108] - Determine to achieve
[0109] a) For the central image region corresponding to central vision, certain optical elements 14F and 14R are at least partially or completely superimposed; this will show that a second optical accumulation effect is provided, for example, to cause the second incident beam L2 to illuminate the central area of the wearer's retina, and the focus shift function (defocused image) of the optical elements in the first set of optical elements (14F) is at least partially or completely canceled by the second set of optical elements (14R) through the reaction focus shift caused by the second set of optical elements (14R).
[0110] b) For the peripheral portion of the image (e.g., 15°), optical elements 14F and 14R do not compensate for or balance each other and form peripheral defocus; this will show that the presence of a first optical accumulation effect is provided, for example, to cause the first incident beam L1 to illuminate the peripheral area of the wearer's retina and achieves a focus shift function (defocused image) in the peripheral area of the wearer's retina.
[0111] As can be seen in Figure 5, optical elements 14F and 14R are well superimposed in the direction of the camera optical axis corresponding to the gaze direction (dashed line 53 – beam L2), while for beam L1, the optical elements are partially offset and do not compensate for each other, and will contribute to the focus shift to produce a defocus function.
[0112] For example, when the refractive areas 12F and 12R of the lens element 10 provide a visual correction of -4.0 diopters, for the gaze direction shown in Figure 5, the central vision will correspond to a visual correction of -4.0 diopters, while for peripheral vision, the image will not focus on the retina, thus helping to control myopia or hyperopia.
[0113] Therefore, it should be understood that the use of the first optical element 14F and the second set of optical elements 14R allows for the expansion of the functionality of the lens element 10, and in particular, the expansion of the specific cooperative functionality of the first set of optical elements 14F and the second set of optical elements 14R in certain viewing directions.
[0114] In particular, it is foreseeable that a "standard" semi-finished lens with a first set of optical elements 14F will be used, and an optimized manufacturing process will be customized to achieve a second set of optical elements 14R for a specific wearer in order to obtain specific myopia or hyperopia control.
[0115] In this case, the geometry of the wearer's eye (center of rotation of the eye, pupil position and retinal shape) can be precisely measured, and the results of this measurement can be taken into account to achieve a custom-designed second set of optical elements 14R.
Claims
1. A lens element (10) intended to be worn in front of a wearer's eye, the lens element comprising at least a first set of optical elements (14F) and a second set of optical elements (14R) respectively providing a first optical function and a second optical function, - wherein, When worn by a wearer, the first set of optical elements (14F) is located further from the rotation center (Q') of the eye than the second set of optical elements (14R). At least some of the optical elements in the first set of optical elements (14F) and the second set of optical elements (14R) are arranged in a manner such that, for at least one gaze direction, a first optical cumulative effect and a second optical cumulative effect are provided simultaneously for corresponding at least a first incident beam and a second incident beam: - The first optical cumulative effect is provided to illuminate the peripheral area of the wearer's retina and includes a focus shifting effect; - The second optical cumulative effect is provided to illuminate the central area of the wearer's retina and includes a counter-focus shifting effect by the second set of optical elements (14R) at least partially or completely against the focus shift caused by the first optical function of the first set of optical elements (14F).
2. The lens element as claimed in claim 1, wherein, A gaze direction is between + / - 10°.
3. The lens element as described in any one of claims 1 to 2, wherein, A gaze direction is between -40° and -20°.
4. The lens element as described in any one of claims 1 to 2, wherein, The lens element (10) includes an anterior refractive region (12F) and a posterior refractive region (12R), which cooperate to achieve refractive power based on a prescription for the wearer's eyes.
5. The lens element as described in any one of claims 1 to 2, wherein, The first set of optical elements (14F) is disposed in front of the lens element (10F).
6. The lens element as claimed in any one of claims 1 to 2, wherein, The second set of optical elements (14R) is disposed on the rear (10R) of the lens element (10).
7. The lens element as claimed in any one of claims 1 to 2, wherein, The first set of optical elements (14F) or the second set of optical elements (14R), or both of them, are integrated in the intermediate layer of the lens element (10).
8. The lens element as claimed in claim 4, wherein, The first set of optical elements (14F) is recessed relative to the pre-refractive region (12F).
9. The lens element as claimed in claim 4, wherein, The second set of optical elements (14R) is recessed relative to the post-refractive region (12R).
10. The lens element as claimed in claim 4, wherein, The first set of optical elements (14F) protrudes relative to the pre-refractive region (12F).
11. The lens element as claimed in claim 4, wherein, The second set of optical elements (14R) protrudes relative to the post-refractive region (12R).
12. The lens element as claimed in any one of claims 1 to 2, wherein, The second set of optical elements (14R) is at least partially ring-shaped.
13. A method for conceiving a lens element as described in any one of claims 1 to 12, intended for wear by a wearer, wherein, The position of the second set of optical elements (14R) is determined relative to the rotation center (Q') of the wearer's eye.
14. A method for manufacturing a lens element as described in any one of claims 1 to 12, intended for wear by a wearer, wherein, The position of the second set of optical elements (14R) is determined relative to the rotation center (Q') of the wearer's eye.
Citation Information
Patent Citations
Lens element
WO2019206569A1
Optical articles having embossed films defining encapsulated microlenses and methods of making the same
CN112888991A