42 results about "Multifocal lenses" patented technology

An ophthalmic multifocal lens is presented, configured to provide distance vision and at least one other usable visual acuity. The lens comprises a translucent lens body having an optical axis and a refractive baseline, the refractive baseline extending to at least a portion of the lens body, and a diffraction grating configured to act as an optical splitter, extending concentrically in the radial direction and superimposed on at least a portion of the refractive baseline. The diffraction grating configured to act as an optical splitter is further configured to be continuous within at least a central 3 mm aperture, wherein the distance vision is provided by the -1st order diffraction, and the near vision is provided by the 2nd order diffraction.

An ophthalmic multifocal lens providing far, intermediate, and near vision having a light transmissive body with an optical axis and a refractive baseline extending over part of the lens body; further having a first portion coinciding with a central area of the lens body and a multifocal second portion extending concentrically radially; the second portion further comprising a symmetric multifocal diffractive grating superpositioned onto the baseline, covering a portion of the lens, its shape and resulting light intensity distribution changing with distance to optical axis, the first portion being substantially concave, connected to the ridge of the grating that is closest to the optical axis and provides a dominant optical power between intended far and intermediate powers; configured to have an energy ratio intended for far vision to energy intended for near vision being lower for predetermined aperture(s).

1. Name of the designed product: trial frame (progressive multifocal lens). 2. Use of the designed product: optometry instrument for human eye examination. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view.

The invention relates to the field of optical lens design, particularly discloses a design method of a double-sided progressive multi-focus lens, and solves the technical problems that the front surface form of a traditional progressive multi-focus lens is single, and different requirements of myopia and presbyopia people on basic bending cannot be met at the same time. The method comprises the following steps: firstly, designing curved surfaces with different base bends of a far vision area and a near vision area of a front surface, then performing thickness compensation processing on the curved surfaces of the front surface, and finally, combining a traditional progressive multi-focus curved surface design rule to obtain a rear surface of the lens, so that double-sided progressive multi-focus collaborative design is realized, and the far vision area and the near vision area of the lens are enabled to adapt to different base bend requirements; and the overall visual effect is improved. The lens designed by the invention is better in optical performance and wider in adaptive crowd, and has higher practical value and market prospect.

The present invention relates to determining at least one individual visual acuity value for at least one eye of a subject, wherein a corresponding method comprises: determining at least one individual subjective visual acuity value for the at least one eye on the basis of an individual response of the subject to a set visual task; acquiring individual objective measurement data for the at least one eye from measurements performed on the at least one eye; and determining, from the at least one individual subjective visual acuity value and the individual objective measurement data, at least one combined visual acuity value as the at least one individual visual acuity value to be determined for the at least one eye of the subject.

The application discloses a stigmation control method of progressive lenses and a related device, and relates to the field of progressive multifocal lens design. The method comprises the following steps: selecting a plurality of sampling points on a first surface in the aperture of the progressive lenses; calculating the average diopter and the stigmation amplitude of each sampling point under a first optical condition and a second optical condition, respectively, and constructing a first residual control item and a second residual control item, respectively; constructing a first stigmation control optimization target according to the first residual control item, and solving a first lens design variable meeting the first stigmation control optimization target; constructing a second stigmation control optimization target according to the second residual control item, and solving the second stigmation control optimization target by taking the first surface structure determined by the first lens design variable as an optimization reference, to obtain a second lens design variable. The application can keep the average diopter distribution stable in the direction of the progressive channel while optimizing the stigmation.

To provide a method for evaluating the performance of a progressive refractive power lens with which it is possible to determine the lens performance of the progressive refractive power lens considering the difference in appearance due to the difference in an axial direction of aberration.SOLUTION: A method for evaluating the performance of a progressive refractive power lens includes: determining astigmatism distribution data on the basis of astigmatism data obtained by measuring or simulating evaluation points distributed on a lens surface of a progressive refractive power lens; and evaluating the performance of the progressive refractive power lens on the basis of the astigmatism distribution data. The method includes: with respect to an axial direction of an aberration component taking an angle within a range of 0-180 degrees in the evaluation point, setting the weight of easiness to see or difficulty to see for each evaluation point according to the axial direction of the aberration component; correcting the astigmatism data by reflecting the weight; and evaluating the performance of the progressive refractive power lens on the basis of the distribution state of the astigmatism data after the correction.SELECTED DRAWING: Figure 3

This invention relates to an optimization method for progressive multifocal lenses. First, a portion of the progressive multifocal lens surface is replaced by a linear superposition of that area and a spherical surface. The spherical surface used is the one whose boundary is closest to the boundary of the replaced lens area, calculated using the least squares method. Then, Zernike polynomials are used to selectively fit the surface elevation of the replaced lens, further smoothing the progressive multifocal lens surface. This invention can control the optical power and astigmatic distribution in the astigmatic region of the progressive multifocal lens surface by changing the location and range of the region, thereby improving surface astigmatism and helping wearers obtain a better visual experience.

The invention relates to a multifocal lens 1 having several concentric diffractive zones 7, 8, 9, 10 on a lens surface 2, wherein in each diffractive zone a diffraction phase structure is defined, which is expressible by the following function or by a smoothed version of the function:ϕ⁡(ξ)=2⁢π×{p1⁢ξ,0≤ξ<w1p2⁢ξ+q2,w1≤ξ<w2p3⁢ξ+q3,w2≤ξ<1,wherein ξ indicates a position within the respective diffractive zone in a radial direction, φ(ξ) indicates a phase shift experienced by light passing through the position indicated by ξ, w1 and w2 define a spatial partitioning of the respective diffractive zone in the radial direction, p1, p2 and p3 indicate gradients and q2 and q3 are constants. The position ξ depends quadratically on a radial distance to the center of the lens surface and is normalized with respect to the radial width of the respective diffractive zone and the gradients p1, p2 and p3 are negative.

This paper describes a double-sided aspherical diffractive multifocal lens and a method for manufacturing and designing such a lens in the field of ophthalmology. The lens includes optics comprising an aspherical front surface and an aspherical rear surface. Multiple concentric diffractive multifocal regions are designed on one of the two surfaces. The other surface may include a toric surface component. Compared to a single-sided aspherical lens, the double-sided aspherical surface design improves the modulation transfer function (MTF) of the lens-eye combination by reducing aberrations and enhancing visual contrast. The surface with multiple concentric diffractive multifocal regions produces near-focal, intermediate-focal, and far-focal points. The phase order of the diffractive annular lens region is shaped into a sinusoidal distribution.

The application relates to the technical field of injection molding processing, and particularly discloses an injection mold for a progressive multifocal lens and an injection molding process thereof, wherein the mold comprises a movable mold and a fixed mold which are oppositely arranged from top to bottom; the top of the fixed mold is provided with a fixed mold cavity; a forming table is arranged inside and below the fixed mold cavity; a forming cavity is arranged in the middle of the top of the forming table; the bottom of the movable mold is provided with a movable mold table which extends into the fixed mold cavity; the bottom of the movable mold table is provided with a shaping die plate which is matched with the forming cavity; after the movable mold and the fixed mold are moved close to each other, an injection mold cavity for lens forming is formed through the shaping die plate and the forming cavity; a deformable die plate corresponding to the progressive light ray surface of the lens is arranged at the bottom of the forming cavity; a temperature control assembly is arranged in the deformable die plate; the temperature change is controlled through the temperature control assembly to realize the accurate adjustment of the curvature of the deformable die plate; the temperature step adjustment of each curved surface section and the accurate curvature adaptation are realized, and the optical precision of the lens after injection molding is improved.

The utility model discloses a progressive lens frame which comprises a lens ring, progressive lenses are fixedly arranged in the lens ring, two sides of the lens ring are connected with lens legs through hinges, a middle beam is arranged in the middle of the lens ring, an adjustable nose wing support of an arch structure is arranged on the middle beam in a penetrating mode, and two ends of the bottom of the adjustable nose wing support are movably connected with stipules. Through holes for the adjustable nose wing support to penetrate through are formed in the two sides of the middle beam in a penetrating mode, a blind hole is formed in one side of each through hole, and a positioning assembly for limiting the adjustable nose wing support is arranged in each blind hole. The adjustable nose wing supports capable of being adjusted up and down are arranged on the middle beam of the glasses frame, flexible adjustment can be carried out according to the heights of nose wings of different wearers, the progressive lens wearers can be adjusted to an optimal wearing angle, the progressive lenses are more comfortable to wear, in addition, the adjustable nose wing supports and the nose pads form an integral arch structure, and the adjustable nose wing supports and the nose pads are more convenient to use. The structure is simple, adjustment is easy, and attractiveness of the mirror frame is not affected.

The invention provides a progressive lens channel measurement method and system based on multi-mode pupil tracking. The method comprises the following steps: synchronously acquiring an original depth image and an original visible light image of a user face, and extracting an eye region interested region from the depth image based on a preset depth threshold value; performing edge extraction and depth consistency verification processing on the region of interest to determine pupil coordinates and motion trail data; collecting a head posture angle in real time and performing coordinate system conversion to determine a compensated space pupil coordinate; calculating an optimal progressive channel parameter by combining the space coordinate, the age parameter and the eye using habit parameter; and finally, the parameters are mapped to a three-dimensional coordinate system with the nose bridge center as the original point, lens curvature imaging deviation is counteracted, and three-dimensional channel marking data and a machining instruction are generated. According to the method provided by the invention, the pupil positioning precision and the fitting individuation degree are improved.

The application discloses a kind of progressive lenses and glasses, wherein the progressive lenses include: lens body, and microlens region is located on lens body, and microlens in microlens region is arranged in close-packed manner on lens body;Wherein, microlens region is at least arranged in astigmatic region of progressive lenses, and in first direction, the refractive power of each microlens in astigmatic region gradually increases, and the first direction is the direction from the far use area of progressive lenses to the near use area.Due to the surface of lens body is provided with a large number of close-packed microlens, each microlens can bear a part of refractive power change respectively, and originally large-scale aberration can be dispersed into multiple small-scale aberration accumulation. Dispersed aberration can avoid the impact of large-scale continuous distortion on vision, and reduce the visual discomfort brought by large-scale distortion to wearer.

Provided in the present invention are a lens manufacturing method and system, a progressive lens, and a repair method. A photoresist is coated on a lens substrate; and a preset micro-nano structure is photolithographed on the lens substrate by means of a photopolymerization reaction between laser light emitted by a laser system and the photoresist so that a lens having a micro-nano structure with a preset layout is obtained, wherein the lens achieves a required refractive index distribution by means of the micro-nano structure with a preset layout. The present invention provides processing capability with higher precision, a smoother transition between refractive indices, and higher design and manufacturing flexibility, thereby meeting market demand for a high-quality progressive lens. The high-precision progressive lens manufacturing method provided in the present invention is a solution proposed with respect to the limitations of a traditional process and aims to improve the optical performance of progressive lenses and the visual experience of users.

The utility model discloses a point diffusion prism lens composite lens, which relates to the technical field of myopic glasses, and comprises a point diffusion lens and a second lens arranged on the inner side or the outer side of the point diffusion lens, and the second lens is selected from one of a combined prism lens, a progressive lens or a defocus lens. The combined prism lens is formed by combining a prism and a convex lens, and the convex lens is located between the prism and the point diffusion lens. The combined prism lens is wedge-shaped, the thicker end of the combined prism lens is a base, and the thinner end of the combined prism lens is a base top. According to the point diffusion prism lens composite lens, the point diffusion lens is respectively compounded with the combined prism lens, the progressive lens or the out-of-focus lens, so that incident light is scattered, soft optical transition is formed in a peripheral view field, and the design reduces the signal intensity difference between adjacent view cone cells, namely, reduces the contrast ratio; therefore, 'elongation signals' transmitted from the retina to the eyeball are inhibited, and eye axis growth is slowed down.

The application discloses a kind of progressive lenses and glasses, progressive lenses include: lens body, and microstructure region is set on lens body, microstructure region includes multiple microscale optical structures, each microscale optical structure can generate high frequency and low amplitude optical distortion signal;Microstructure region at least covers the astigmatic region of progressive lenses, the frequency of optical distortion signal is higher than the frequency of astigmatic signal of astigmatic region, and the amplitude of optical distortion signal is lower than the amplitude of astigmatic signal.Therein, since the low frequency, large scale distortion of lens body itself generates strong light flow disturbance in dynamic vision, leading to brain to be explained as environmental movement, and further, in the application, by increasing the microstructure region of high frequency, low amplitude on lens, so that the wearer produces adaptability to high frequency subtle signal, to cover or break the regular light flow generated by low frequency distortion, so that brain is difficult to detect the overall slow distortion, thereby weakening the discomfort brought by surge effect.

Three multifocal lenses 100, each lens including an optical zone. Each optical zone Oz includes a near vision zone 110, a transition vision zone 120, and a far vision zone 130 surrounding the near vis

The application discloses a kind of progressive lenses and glasses, wherein, progressive lenses include: lens body, and micro lens area on lens body, micro lens area includes multiple micro lenses, at least one micro lens is formed at the position of corresponding lens body surface The astigmatism of can be offset with the astigmatism of the same position of lens body itself;Micro lens area at least covers the astigmatism area of lens body. Thus, the embodiment of the application sets up the micro lens of corresponding astigmatism by the part that lens body has astigmatism, so that the astigmatism of these micro lenses itself can offset the self astigmatism of lens body at the arrangement position, so that the wearer is basically no longer present astigmatism when wearing the glasses. Further, even when wearing the glasses, the wearer will not appear the dizziness caused by the surge effect when turning head or shaking, etc., can improve user experience.

The application discloses an evaluation method and a design method of a bifocal progressive multifocal lens, and the evaluation method comprises the following steps: arranging a plurality of discrete sample points P bi on the back surface of the lens; selecting n pairs of light ray starting points on the circumference of a pupil; determining two light rays of the first pair of light ray starting points to the back surface of the lens in the direction parallel to the center of the pupil to the sample point P bi , and obtaining two intersection points of the two light rays with the front surface of the lens and the outgoing vectors s1 and s2 from the two intersection points through ray tracing; obtaining the intersection point of the two outgoing light rays and the distance from the intersection point to the sample point, and taking the reciprocal of the distance as the surface power of the first pair of light ray starting points; obtaining the surface power of other pairs of light ray starting points corresponding to the same sample point; taking the difference between the maximum value and the minimum value of each surface power corresponding to the sample point as the astigmatism value of the sample point; and obtaining the astigmatism value corresponding to each sample point to simulate the astigmatism distribution of the lens. The application can more accurately reflect the visual effect when the lens is used.

The application provides a progressive lens function area division method, comprising: establishing a lens view point coordinate prediction model special for a lens fitting user; collecting first input information of the lens fitting user when performing a viewing task while wearing a correction trial lens, and correcting a deviation of a pupil center coordinate in the first input information caused by optical refraction of the correction trial lens; inputting the corrected first input information into the lens view point coordinate prediction model special for the lens fitting user, and obtaining corresponding lens view point coordinates through the lens view point coordinate prediction model; and performing lens function area division on the lens actually worn by the lens fitting user based on the obtained lens view point coordinates. The application improves the problem of lacking personalized parameters in conventional fitting; and a corresponding compensation correction method is provided for the problem that the lens optical refraction causes deviation of the camera recorded pupil position from the actual pupil position after the superposition of multiple trial lenses, and the tracking of the lens view point is affected.

A lens manufacturing method, in which photoresists varying in refractive index are coated on a lens substrate; a photopolymerization reaction of the photoresists is induced by a laser beam emitted from a laser system to lithographically form at least two micro / nano structure sets varying in optical properties on the lens substrate, thereby obtaining a lens having the micro / nano structure sets arranged in a predetermined layout. The lens realizes a required refractive-index distribution through the micro / nano structure sets in the predetermined layout. A minimum feature size of the micro / nano structure sets is 50 nanometers. A lens manufacturing system, a progressive lens and a repair method are also provided.

To provide a method for designing the lens surface of a progressive refractive power lens in which the difference of visibility due to the difference of the axial direction of aberration is considered when designing the lens surface of the progressive refractive power lens.SOLUTION: A method for designing a lens surface of a progressive addition lens, the method including acquiring an optical performance of a design simulation value by repeatedly executing a ray tracing simulation while changing a shape of the lens surface so as to approach an optical performance of a design target value with respect to evaluation points distributed on the lens surface of the progressive addition lens, and determining a shape of a progressive surface by optimization calculation, the method including: A correction value for reflecting the weight of visibility with an angle in the axial direction of an aberration component as a parameter on the size of the aberration component is acquired, and the acquired correction value is applied to a design target value or a function used for a ray tracing method to calculate a design simulation value in optimization calculation.SELECTED DRAWING: Figure 8

The invention discloses a customized multi-focus lens and a design method thereof, the inner surface of a lens substrate is a free-form surface structure, and the customized multi-focus lens is designed based on personalized parameters of a user and an adjustment space model determined by the personalized parameters. The adjustment space model determines an object distance convergence and divergence range corresponding to a user from a relaxed adjustment state to a maximum adjustment state, and the object distance convergence and divergence range is obtained by iteratively optimizing an evaluation function; the evaluation function integrates the blurring intensity caused by oblique aberration, the adjustment weight associated with the adjustment ability of the user and the area weight for distinguishing the importance of different functional areas. According to the method, the dynamic adjustment space model based on the user adjustment amplitude is introduced, and the inner surface free-form surface iterative optimization and differentiated region weight strategy are combined, so that the precise control and surface smooth transition of the oblique aberration under the full view field and the full object distance are realized; therefore, the visual definition, the wearing comfort and the personalized adaptation capability of the lens are remarkably improved.

The utility model relates to an edge-transparent combined progressive lens capable of reducing contrast, the progressive lens is divided into a far-use area, a transition area and a near-use area from top to bottom, the far-use area is a contrast concave lens or plano lens, the near-use area is a contrast edge-lens assembly, the contrast edge-lens assembly is a prism and a lens (convex lens, concave lens, convex lens, concave lens, convex lens, concave lens, convex lens, concave lens, convex lens, concave lens, convex lens, concave lens, convex lens, concave lens, convex lens, concave lens, convex lens, concave lens, convex lens, concave lens and convex and the transition area is a transition belt used for transition from the far-use area to the near-use area, and is formed by combining the far-use area, the near-use area, the concave lens or the plano lens. According to the technical scheme, through the semitransparent light scattering area distributed on the inner surface of the progressive lens, the laser micro-carving particle points in the semitransparent light scattering area are used for scattering light, reducing light signal difference and reducing retina contrast, and therefore myopia growth caused by high contrast is reduced.

The utility model relates to the technical field of surgical glasses, in particular to surgical glasses suitable for conversion between a 3D laparoscopic surgery and a common surgical operating table. According to the technical scheme, the glasses comprise a glasses frame, ear hanging parts are connected to the two sides of the glasses frame, and the glasses frame comprises a plane mirror and a 3D lens; each ear hanging part comprises horizontal rods fixedly connected to the two sides of the glasses frame, ear hanging rods are arranged at the parallel positions below the horizontal rods, micro motors are installed in the ear hanging rods, the output ends of the micro motors are connected with screw rods, the screw rods are connected with two sets of supporting rods, and the top ends of the supporting rods are rotationally installed on the lower surfaces of the horizontal rods. The lenses of the glasses adopt multi-focus lenses, have different optical characteristics in different areas, meet different requirements of 3D and naked eyes, reduce the adjustment burden of the glasses, and do not need to replace or remove the glasses during the operation of a 3D display screen and a common operation.

The invention discloses a composite out-of-focus multifocal lens and a manufacturing method thereof, and belongs to the technical field of optical lens, the lens comprises a substrate, the substrate comprises a first aspheric body and a second aspheric body, the first aspheric body comprises a first upper working surface and a first lower working surface, and the second aspheric body comprises a second upper working surface and a second lower working surface. The first aspheric body comprises a first upper working surface and a first lower working surface, the second aspheric body comprises a second upper working surface and a second lower working surface, a first light-transmitting area is formed on the first upper working surface, a plurality of second light-transmitting areas are arranged on the second upper working surface and form a plurality of first array rings on the second upper working surface, and a plurality of first frosted points are further arranged on the second upper working surface. The first light-transmitting area serves as a central area and is imaged on the surface of the retina, the second upper working surface serves as a defocusing area and is imaged in front of the retina, and the light-transmitting array and the dot matrix area of the second light-transmitting area are located in the same defocusing area to induce human eyes to be adjusted in the direction of incident light and opposite to the direction of eye axis growth so as to reduce eye axis growth.