74 results about "Multifocal lenses" patented technology

The invention relates to the technical field of injection molding machining, and particularly discloses an injection mold of a progressive multi-focus lens and an injection molding process thereof.The mold comprises a movable mold body and a fixed mold body which are oppositely arranged from top to bottom, a fixed mold cavity is formed in the top of the fixed mold body, a molding table is arranged on the lower portion in the fixed mold cavity, and a molding cavity is formed in the middle of the top of the molding table; a movable mold table extending into the fixed mold cavity is arranged at the bottom of the movable mold, a shaping mold plate matched with the forming cavity is arranged at the bottom of the movable mold table, and after the movable mold and the fixed mold are close to each other to be closed, an injection mold cavity used for lens forming is formed through the shaping mold plate and the forming cavity; a deformable template corresponding to the progressive light curved surface of the lens is arranged at the bottom of the forming cavity, a temperature control assembly is arranged in the deformable template, and the temperature control assembly is used for controlling the temperature change to achieve accurate adjustment of the curved surface curvature of the deformable template; the temperature step adjustment of each curved surface section is precisely matched with the curvature, so that the optical precision of the injection-molded lens is improved.

A method for automatically determining multifocal lens parameters associated with a contact lens and a contact lens for correcting ametropia of a patient's eye wherein a personalized multifocal contact lens for treating presbyopia takes into account various related clinical patient measurements including patient clinical data and lifestyle data, to determine which lens is likely to provide personalized lens parameters for new patients. Historical patient clinical data and lifestyle data are used to train the system to predict which multi-focal lenses (i.e., lenses including lens designs and having lens geometries and powers) would result in optimal lens-to-eye fit and optimal visual function for each eye of presbyopia patients.

The invention provides a lens manufacturing method and system, a progressive lens and a repairing method. The repairing method comprises the following steps: coating photoresist on a lens substrate; and photoetching a preset micro-nano structure on the lens substrate through a photopolymerization reaction between laser emitted by a laser system and the photoresist to obtain the lens with the micro-nano structure in a preset layout mode, and realizing the required refractive index distribution of the lens through the micro-nano structure in the preset layout mode. The invention provides higher-precision processing capability, smoother refractive index transition and higher design and manufacturing flexibility, thereby meeting the requirements of the market for high-quality progressive lenses. The high-precision progressive lens manufacturing method provided by the invention is a solution provided aiming at the limitation of a traditional process, and aims to improve the optical performance of the progressive lens and the visual experience of a user.

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.

The invention discloses a peripheral defocus principle-based progressive multi-focus optical correction method, which belongs to the technical field of vision correction and comprises the following steps of S1, collecting eye data of teenagers; s2, eye biological parameters are extracted; s3, calculating the change relation between the center defocusing amount and the peripheral defocusing amount under the dynamic change of different field angles and different pupil diameters; s4, presetting a target center defocusing amount and a peripheral defocusing amount of the progressive multi-focus lens under different field angles and different pupil diameter dynamic changes, and calculating a difference value between the target center defocusing amount and the peripheral defocusing amount under different field angles and different pupil diameter dynamic changes of eyes as a to-be-adjusted defocusing amount; s5, calculating parameters of the progressive multi-focus lens; s6, constructing a progressive multi-focus lens model; s7, optimizing the progressive multi-focus lens model; s8, performing optical correction by using the optimized progressive multi-focus lens model; the traditional Chinese medicine composition has a treatment effect and a prevention and control effect at the same time.

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.

A new generation of multifocal ophthalmic lenses and a method for manufacturing the same. The lens provides at least focal points for myopia, intermediate vision, and hyperopia. The lens body provides a refractive focus for intermediate vision. The lens body includes a diffraction grating (91) that operates as a light wave beam splitter, providing a diffraction focus for myopia and a diffraction focus for hyperopia. The lens body includes a single focus central region (92) that extends at a distance from the optical axis of the lens body and provides a focus that coincides with one of the diffraction focuses. The diffraction grating (91) is arranged at a radial position from a transition point (93) where the single focus central region (92) of the lens body ends. At the transition point (93), the diffraction grating (91) and the single focus central region (92) have overlapping amplitude values.

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

A method for determining a design of a progressive lens intended to be worn by a future wearer, the progressive lens comprising a front surface and a back surface, at least one of the front surface and the back surface comprising a progression profile on its general spherical shape, said at least one progression profile defining a meridian line extending from a distance-vision point to a near-vision point, said meridian line comprising a vertical portion passing through the distance-vision point and an inclined portion passing through the near-vision point, the vertical portion and the inclined portion forming an angle between them, the method including obtaining first data representative of a first measurement of a first postural instability of the future wearer when seeing a visual pattern moving along an mediolateral direction, and determining a reparation between the first progression profile and the second progression profile based on the first data.

A multifocal lens (1) with at least three main refractive powers (DF, DM, DN) has a plurality of concentric, mutually adjacent annular main zones (Zi), each of which is divided into an inner and an outer annular subzone (2, 3) of different refractive powers (D1, D2), wherein the lens (1) is free of geometric steps between all subzones (2, 3), wherein the refractive powers (D1) of all inner subzones (2) are equal to one another and the refractive powers (D2) of all outer subzones (3) are equal to one another, and wherein all inner and outer subzones (2, 3) share their respective main zone (Zi) in an equal area ratio which is in the range from 30:70 to 70:30.

A personalized multifocal contact lens for treating presbyopia takes into account various relevant clinical patient measures including patient clinical data (2123) and lifestyle data (2122) to determine which lens will likely provide the new patient with a personalized lens parameter. The system is trained using historic patient clinical data (2123) and lifestyle data (2122) to predict which manufactured multifocal lens (i.e., a lens comprising lens design and having a lens geometry and optical power) will result in a lens with an optimum lens to eye relationship and optimum visual performance for each eye of a patient with presbyopia.

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 invention discloses an edge grinding device for lens machining. The edge grinding device comprises an edge grinding machine; the edge grinding cavity is formed in the edge grinding machine; the first supporting rod is mounted in the edge grinding cavity; the second supporting rod corresponds to the first supporting rod in position and is arranged in the edge grinding cavity; and the grinding wheel is arranged in the edge grinding cavity and is connected to the first driving shaft and the second driving shaft through a dismounting mechanism. The grinding wheel replacement efficiency is improved, the elastic insertion mechanism provides pre-installation positioning, the bolt alignment time is shortened, and the disassembly and assembly time consumption is reduced; the stability is guaranteed through double locking, the elastic mechanism is combined with the bolt in a locking mode, displacement caused by machining vibration is avoided, and rigid connection under the high-load working condition is guaranteed; the modular abutting plate is designed to support quick replacement, and spherical, aspheric and progressive multi-focus lenses can be processed by matching with the abutting pads with different curvatures; and the maintenance cost is low, no violent dismounting risk exists in the dismounting process, and the key elastic piece can be independently replaced.

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 relates to the field of ophthalmic lens design, in particular to a personalized progressive lens design method according to lens viewpoint data. According to the method, a personalized adjustable presbyopia model is constructed based on an optometry prescription of a wearer; the method comprises the following steps: acquiring lens viewpoint data of a wearer through lens viewpoint acquisition equipment, generating a viewpoint density map, and extracting a high-frequency use area to construct a multiple structure; evaluating the imaging quality of the traditionally designed progressive lens on the retina in the sight line moving process of the wearer by combining with an eye model; and adding a composite surface, and synchronously optimizing the appearance of the composite surface under multiple structures by minimizing wavefront aberration through a multiple structure editor to obtain the personalized progressive lens based on viewpoint data. The personalized progressive lens provided by the invention can effectively improve the imaging quality of a high-frequency viewpoint area.

The progressive lens comprises a lens body and a microstructure area arranged on the lens body, the microstructure area comprises a plurality of micro-scale optical structures, and each micro-scale optical structure can generate optical distortion signals with high frequency and low amplitude; the microstructure area at least covers the astigmatism area of the progressive lens, the frequency of the optical distortion signal is higher than that of an astigmatism signal of the astigmatism area, and the amplitude of the optical distortion signal is lower than that of the astigmatism signal. Wherein the lens body has low-frequency and large-scale distortion, so that strong optical flow disturbance is generated in dynamic vision, and the brain explains the distortion as environmental motion, and furthermore, a micro-structure area with high frequency and low amplitude is additionally arranged on the lens, so that a wearer has adaptability to high-frequency fine signals, and the high-frequency fine signals can be obtained. A regular optical flow generated by low-frequency distortion is covered or disrupted, so that the brain is difficult to perceive the overall slow distortion, and the discomfort caused by the surging effect is weakened.

The present invention provides a lens manufacturing method and system, a progressive lens, and a repair method. A photoresist is coated on a lens substrate; laser light emitted by a laser system reacts with the photoresist to photopolymerize the photoresist, thereby etching a predetermined micro-nanostructure onto the lens substrate. This results in a lens having a predetermined micro-nanostructure layout. The lens achieves a desired refractive index distribution through the predetermined micro-nanostructure layout. The present invention provides higher-precision processing capabilities, smoother refractive index transitions, and greater design and manufacturing flexibility, thereby meeting market demand for high-quality progressive lenses. The high-precision progressive lens manufacturing method proposed in the present invention addresses the limitations of traditional processes and aims to improve the optical performance of progressive lenses and the user's visual experience.

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.