31 results about "Astigmatism correction" patented technology

The invention relates to the technical field of optical fiber device manufacturing, and discloses a femtosecond laser inscribing low-polarization-dependent-loss optical fiber grating method and system, and the method comprises the steps: firstly, synthesizing an initial phase comprising a flat-topped beam phase, an astigmatism correction phase and a defocus phase, and loading the initial phase to a spatial light phase modulator; therefore, a preset circular flat-top focusing light spot is generated. Secondly, collecting a three-dimensional light field image sequence of a focusing light spot in a low-power detection mode, reconstructing light intensity distribution, extracting effective focal depth and ovality characteristic parameters, dynamically optimizing a phase through a closed-loop feedback mechanism until light field characteristics reach a preset target, and obtaining an optimized phase; and finally, loading an optimized phase in a high-power inscribing mode, and controlling the axial scanning of the optical fiber to inscribe the grating. Accurate active regulation and control of the three-dimensional shape of the focused light field and closed-loop self-optimization of process parameters are realized, birefringence caused by anisotropy of a refractive index modulation area is inhibited from a physical mechanism, and polarization dependent loss of the fiber bragg grating is fundamentally reduced.

The invention discloses an astigmatism coaxial decomposition method, system and device for analyzing the astigmatism correction effect of a corneal refractive surgery, and relates to the technical field of corneal refractive surgeries, and the method comprises the steps: obtaining a preoperative subjective optometry result and a postoperative subjective optometry result of a to-be-evaluated user; based on the preoperative subjective optometry result and the postoperative subjective optometry result, the actual correction refractive power decomposed in the axial direction of the expected correction lenticular lens is determined; based on the preoperative subjective optometry result and the postoperative subjective optometry result, the maximum actual correction refractive power decomposed in the direction perpendicular to the axial direction of the expected correction lenticular lens is determined; the surgical actual corrective diopter of the user is determined based on the actual corrective power decomposed in the axial direction of the lenticular and the maximum actual corrective power decomposed perpendicular to the axial direction of the lenticular. According to the astigmatism description method provided by the invention, the efficiency, practicability and comprehensiveness of astigmatism correction effect analysis are improved.

Adaptive fashion glasses with universal vision correction, characterized by: - a liquid lens (1) with an adjustable diopter range from -6 to +4 - a rotatable astigmatism correction ring (4) with an adjustment range from 0° to 180° - a fashion eyeglass frame (2) made of acetate - an adjustment mechanism (3) for manual diopter adjustment - a touch sensor (5) in the bridge area - Multi-user capability through individual adjustability

The invention discloses an imaging parameter correction method capable of automatic focusing and astigmatism correction based on deep learning. The imaging parameter correction method comprises the following steps: acquiring an image as a reference image under a current imaging parameter set; positive increment and negative increment are applied to one or more imaging parameters in the current imaging parameter set to obtain a positive disturbance parameter set and a negative disturbance parameter set, and images are collected under the positive disturbance parameter set and the negative disturbance parameter set respectively to serve as a positive disturbance image and a negative disturbance image; respectively calculating difference images between the positive disturbance image and the reference image and between the negative disturbance image and the reference image; obtaining a prediction parameter adjustment amount by using an imaging parameter correction model based on the difference image; and adjusting the current imaging parameter set according to the predicted parameter adjustment amount. The difference image between the positive disturbance image and the reference image and the difference image between the negative disturbance image and the reference image are provided for the model to carry out adjustment amount prediction, so that the adjustment direction information of imaging parameters is effectively extracted, and the robustness under the condition of a low signal-to-noise ratio is enhanced.

Anamorphic lens assembly having first and second anamorphic lens components, each having an astigmatism at infinity focus that is greater than an astigmatism at close focus. As the anamorphic lens assembly transitions from infinity focus to close focus, the astigmatism decreases for both of the first and second anamorphic lens components, which allows for proper focusing at close focus (when the object is close to the lens assembly). The astigmatism of the first anamorphic lens component may be equal and opposite to the astigmatism of the second anamorphic lens component, such that the astigmatisms of the anamorphic lens components cancel out one another.

The utility model provides a toric ophthalmic lens, and relates to the technical field of ophthalmic optics. The toric ophthalmic lens is used for correcting astigmatism of human eyes; an optical part of the lens is provided with a geometric center, in a circular or annular range with the geometric center as a circle center, the focal power distribution trends in two radial directions on the same diameter are symmetrical about the geometric center, and the focal power distribution trends in the radial directions corresponding to any two different angles are the same. According to the toric ophthalmic lens provided by the utility model, the distribution trends of the focal powers in the two radial directions on the same diameter are symmetrical about the geometric center, and the distribution trends of the focal powers in the radial directions corresponding to any two different angles are the same; while astigmatism correction is achieved, it is guaranteed that functionality in any radial direction is the same, and the overall optical performance of the lens is more accurate.

Sample regions of interest (ROIs) for use in autofocus procedures are identified based on a gradient image of the sample. ROIs with gradient values greater that a threshold are selected, and eigenvalues of the associated image matrices are determined. ROIs with suitable variation in eigenvalues such as at least two relatively large eigenvalues are associated with high contrast features orientated in multiple directions so that such ROIs are suitable for automatic focus and astigmatism correction. Suitable ROIs can also be identified based on a histogram of gradient orientations.

The invention discloses a fixed-axis contact lens capable of preventing highlight patterns from rotating. The fixed-axis contact lens comprises an optical area located in the center, a balance area arranged around the optical area, auxiliary supporting areas symmetrically arranged on the left side and the right side below the balance area, a thinning area arranged above the balance area and a vertical weight area arranged below the auxiliary supporting areas. Transition buffer areas are arranged on the peripheries of the thinning area, the auxiliary supporting area and the vertical weight area, and edge areas are arranged on the peripheries of the transition buffer areas. According to the invention, the thinning area and the vertical weight area are oppositely arranged in the vertical direction, and the asymmetric thickness structure of the auxiliary supporting area is combined, so that a vertical and horizontal two-dimensional anti-rotation locking mechanism is formed, the angle deviation of the highlight pattern can be controlled within + / -1 degree, and meanwhile, the oxygen permeation rate and the wearing comfort are ensured; the contact lens is suitable for highlight decoration and astigmatism correction.

The present application relates to the technical field of laser pulse compression, and discloses a nonlinear pulse compression method and related device based on an annular tire surface multi-pass cavity. The method comprises: using an annular tire surface multi-pass cavity as the core component of nonlinear pulse compression, the multi-pass cavity adopts a closed annular optical path, and the cavity surface of the annular tire surface multi-pass cavity corresponding to the annular cavity is processed with a tire surface for astigmatism correction; coating the cavity surface of the annular cavity with a low chirp or negative chirp dielectric film or metal film to avoid the introduction of positive chirp or nonlinear chirp during pulse reflection; inserting a solid medium or an inert gas into the annular cavity as a nonlinear medium to regulate the nonlinear effect in the multi-pass cavity; incidenting the pulse to be compressed into the annular tire surface multi-pass cavity, and changing the number of reflections of the pulse to be compressed in the cavity by adjusting the incident angle to adjust the optical path and intensity of the nonlinear effect; and performing dispersion compensation on the pulse that has completed nonlinear spectral broadening through the annular tire surface multi-pass cavity to achieve pulse compression.

The invention discloses an astigmatic lens transposition simulator. The astigmatic lens transposition simulator is composed of a simulation gazing device, a handheld support, a connecting piece, a sleeve and a base. The simulation gazing device is provided with a simulation clamping groove and an object image clamping ring which are respectively used for installing an astigmatism cylindrical lens and a test standard card, and the principle of simulating the astigmatism lens transposition operation through the astigmatism cylindrical lens is that when the degrees and the axial directions of the two astigmatism cylindrical lenses are consistent, the sum of the two lenses represents the original astigmatism degree of a patient, and at the moment, the sighting target card and object image deformation are observed through the simulator; if one lens is fixed and the other lens is rotated by 90 degrees, the objective image is normal, and astigmatism of the patient is corrected; the corneal stroma which is half of the astigmatism degree of a patient is cut off through femtosecond laser, the cut corneal stroma is rotated by 90 degrees, and the astigmatism of the patient is eliminated. The invention aims to provide accurate visual simulation for ophthalmic clinical communication and astigmatism correction preoperative evaluation. Visual effects under different astigmatism states can be visually displayed, and preoperative evaluation accuracy and patient treatment adaptability are improved.

The invention discloses an astigmatism correction type asymmetric peripheral defocusing corneal contact lens which comprises an optical correction area, a peripheral defocusing area, a transition area, an off-axis positioning area and an astigmatism axis position mark. The optical correction area provides optical imaging and astigmatism correction; the peripheral defocusing area provides asymmetric peripheral defocusing to realize hyperopia asymmetric defocusing of the marginal area of the retina; the transition area is a transition area between the outside of the peripheral defocusing area and the positioning area; the upper side and the lower side of the off-axis positioning area are different in thickness and are used for wearing and positioning the contact lens; different areas of the corneal contact lens are designed, an enforceable algorithm is provided, the optical correction area provides correction of astigmatism ametropia, the peripheral defocus area provides asymmetric hyperopia defocus, hyperopia asymmetric defocus of the marginal area of the retina is achieved, and the optical correction area and the peripheral defocus area are integrated into the corneal contact lens. The upper side and the lower side of the off-axis positioning area are different in thickness, and the off-axis positioning design of ergonomics is better met.

The invention discloses a nanoscale morphology contrast characterization method under an SEM ultra-low voltage and a short working distance, and relates to the technical field of material surface microstructure detection and analysis, a sample is placed on a sample table, and a target area is selected in a TV mode; switching to an imaging mode, and performing astigmatism correction and focusing under the conditions of conventional acceleration voltage and working distance; switching back to the TV mode, and shortening the working distance to be lt; 5 mm; switching to the imaging mode again, reducing the acceleration voltage to be less than or equal to 1kV, and focusing and imaging the same area; and repeating the steps, and carrying out system imaging under different parameter combinations of ultralow voltage and short working distance so as to obtain nanoscale morphology contrast information of the sample metasurface. According to the invention, through the cooperation of ultra-low voltage and short working distance, the nondestructive and high-contrast visualization of the surface nanoscale native morphology can be realized without metal spraying, and the technical problems that the surface signal is averaged and the charge damage is serious under the deep nanoscale of the traditional SEM are solved.

This invention discloses a high-transmittance adaptive focusing liquid crystal lens structure and standardized preparation method supporting polymer nanotransmission, belonging to the field of intelligent wearable optical devices and nanomaterial transmission technology. The lens adopts a four-layer integrated stacked structure consisting of a wear-resistant and anti-fouling blue light blocking protective layer, a polarization-independent gradient refractive index liquid crystal focusing layer, a nano-metasurface polarization conversion layer, and a high-transmittance substrate layer. A carbon nanotube-graphene-polyimide composite polymer nanotransmission interface is integrated at the edge. Through a precise 45°±0.3° angle between the metasurface layer and the liquid crystal molecule director and a bipolar polarizer composite liquid crystal design, it achieves a transmittance ≥82%, polarization independence ΔT ≤3.2%, focusing response ≤180ms, steady-state error ≤±0.10D, and nanotransmission loss ≤3% under polarizer-free conditions. It can be adapted to -10.00D to +6.00D myopia / hyperopia and ±6.00D astigmatism correction. This invention features a standardized six-step mass production process, with a single-piece manufacturing time of ≤90 minutes and a yield of ≥95%, completely solving common industry pain points such as low light transmittance, polarization dependence, high transmission loss, inconsistent processes, and difficulty in large-scale mass production of traditional liquid crystal lenses. This invention boasts an original structure, novel process, and performance comprehensively superior to similar international technologies, possessing extremely high patent licensing value and industrial mass production value.

This application relates to intraocular lenses (IOLs) in medical devices, specifically to a fully free-form astigmatism correction IOL. This IOL comprises an optical portion and a mechanical portion. One surface of its optical portion is a fully free-form surface, and the other surface is spherical or aspherical. The fully free-form surface is customized using an irregular xy polynomial based on the patient's corneal astigmatism value. This invention allows for free adjustment of various types of astigmatism, achieving full optical surface aberration adjustment, and providing customized IOLs for astigmatism patients. This invention addresses the limitations of traditional astigmatism lenses, solving the problem of residual astigmatism in patients with irregular astigmatism due to the asymmetrical distribution of irregular astigmatism angles, and achieving astigmatism correction at fully free angles on the optical surface.

This invention discloses a miniaturized, all-electrostatic scanning electron microscope (SEM) lens suitable for in-situ lunar surface exploration, belonging to the field of lunar exploration technology. It includes: an electron gun, a condenser lens module, a microchannel plate detector, and an objective lens system, all fixed sequentially along the axis. The lens employs an all-electrostatic system, with through-holes in the condenser lens module and objective lens system to introduce the natural vacuum environment of the lunar surface. The condenser lens module features an innovative multi-functional electrode structure, enabling the condenser to also function as an aperture stop. The objective lens system integrates an electrostatic deflector capable of simultaneously performing scanning deflection and astigmatism correction. This invention, through its all-electrostatic design, integrated and compact design for introducing lunar surface vacuum, effectively overcomes the magnetic leakage and heat loss of traditional electromagnetic lenses, reduces reliance on complex vacuum equipment, improves system integration, and meets the requirements for miniaturization and lightweight lunar surface exploration payloads. It also enhances the structural reliability of the system under launch vibration and lunar seismic environments.

The application provides a partitioned far-near vision alternating function lens, which has good inhibitory effect on far vision, oblique vision and near vision through the combination and alternating layout design of far vision and near vision lenses. Technical points are as follows: the lens body is provided with a concentric ring structure on the surface, the concentric ring structure comprises a plurality of near vision ring areas and far vision ring areas arranged in the same center, the near vision ring areas and the far vision ring areas are arranged in cross-adjacent distribution from inside to outside, the central area of the concentric ring structure has a circular central far vision area, and the remaining area of the lens body after removing the concentric ring structure and the central far vision area is a transition area. The lens body adopts a partitioned structure, the far vision areas and the near vision areas with different curvature radii are arranged in a concentric ring shape, so that the central area has good near vision inhibition and astigmatism correction effect. Meanwhile, the independent transmittance of the polarization structure and each partition makes the far vision area and the near vision area form a grating, which has good correction effect on high far vision and oblique vision.

The invention provides a toric ophthalmic lens and a curved surface calculation method of the toric ophthalmic lens, and relates to the technical field of ophthalmic optics. The toric ophthalmic lens is used for correcting astigmatism of human eyes; an optical part of the lens is provided with a geometric center, in a circular or annular range with the geometric center as a circle center, the focal power distribution trends in two radial directions on the same diameter are symmetrical about the geometric center, and the focal power distribution trends in the radial directions corresponding to any two different angles are the same. According to the toric ophthalmic lens provided by the invention, the distribution trends of the focal powers in the two radial directions on the same diameter are symmetrical about the geometric center, and the distribution trends of the focal powers in the radial directions corresponding to any two different angles are the same; while astigmatism correction is achieved, it is guaranteed that functionality in any radial direction is the same, and the overall optical performance of the lens is more accurate.

Anamorphic lens assembly having first and second anamorphic lens components, each having an astigmatism at infinity focus that is greater than an astigmatism at close focus. As the anamorphic lens assembly transitions from infinity focus to close focus, the astigmatism decreases for both of the first and second anamorphic lens components, which allows for proper focusing at close focus (when the object is close to the lens assembly). The astigmatism of the first anamorphic lens component may be equal and opposite to the astigmatism of the second anamorphic lens component, such that the astigmatisms of the anamorphic lens components cancel out one another.

The invention relates to a large-depth-of-field astigmatism correction type implantable contact lens based on a photoetching technology and a preparation method, and belongs to the technical field of ophthalmology implantation instruments. The optical area of the contact lens comprises a central functional area and a peripheral adaptive area; the diameter of the central functional area is 1.2 mm, and a 32-order continuous curvature gradient structure is formed by processing through a deep ultraviolet curved surface photoetching technology; the curvature change range is 7.0 mm to 7.8 mm. Smooth transition without optical abrupt change is achieved between the 32-order curvature transition area of the central functional area and the peripheral adaptive area through a 0.2 mm wide transition curvature section. A sub-wavelength polarization regulation grating is arranged in the peripheral adaptation area, the grating is formed through the photoetching-ion beam etching technology and is of a rectangular tooth-shaped structure, the grating period is 300-500 nm, the depth is 0.12 m + / -0.02 m, and the included angle between the grating line direction and the optical center axis is 45 degrees. According to the invention, the night glare rate can be greatly reduced, the detail resolution under the medium-high spatial frequency is improved by more than 30% compared with the existing product, and the processing technology can greatly improve the yield.

The present invention relates to a contact lens for astigmatism correction and a method of designing same and, more particularly, to a contact lens for astigmatism correction and a method of designing same, wherein: the inner surface of a lens body is formed as a first curved surface extending radially from the center thereof; at least a portion of the outer surface of the lens body is formed as a second curved surface extending radially from the center thereof; the lens body is formed such that the center of the first curved surface and the center of the second curved surface are offset from each other in a plan view of the lens body; a ballast region including the thickest portion of the lens is formed on the side opposite to the center of the first curved surface with respect to the center of the second curved surface on an imaginary line connecting the center of the first curved surface and the center of the second curved surface in the plan view of the lens body; and the thickest portion of the lens is formed such that the lower edge of an upper eyelid and the upper edge of a lower eyelid do not pass over the portion when a user blinks while wearing the contact lens.

The invention provides a free-form surface astigmatism lens design method based on differentiable ray tracing, is used for astigmatism correction of specific axial positions of human eyes, and belongs to the field of eye vision optical design. Design of the free-form surface lens is realized through a differentiable ray tracing technology, the method fuses multi-lens-eye distance simulation to comprehensively evaluate aberration, constraints of edge thickness and surface curvature inflection points are synchronously introduced in an optimization process, and optimization iteration of a free-form surface system is driven by gradient calculation of lens parameters by means of an evaluation function. And finally, focal power matching in different view fields is realized through the high degree of freedom of the curved surface, so that personalized astigmatism correction requirements of specific axial positions of human eyes are met, the method is suitable for design and manufacturing of astigmatism correction lenses, and the astigmatism correction effect can be improved compared with design of traditional spherical cylinders and the like.

An apparatus may include a viewing optic. The viewing optic may include a first rotatable phase plate, a second rotatable phase plate, and an adjustable focus device. The viewing optic may be configured to image light from a display, the imaged light having a spherical power, a cylindrical power, and a cylindrical axis. The spherical power, the cylindrical power, and the cylindrical axis of the imaged light may be controlled by adjusting the adjustable focus device, rotating the first rotatable phase plate, and rotating the second rotatable phase plate. Other devices, apparatuses, systems, and methods of manufacture are also disclosed.

An ophthalmic apparatus includes an interference optical system, an optical scanner controller, and a correction controller. The interference optical system includes an astigmatism correction optical member and an optical scanner, and is configured to split light from a light source into reference light and measurement light, irradiate the measurement light onto the subject's eye via the astigmatism correction optical member and the optical scanner, and detect interference light between returning light of the measurement light and the reference light. The optical scanner controller is configured to control the optical scanner so as to deflect the measurement light in a horizontal direction and a vertical direction on a plane perpendicular to an optical axis of the interference optical system. The correction controller is configured to control the astigmatism correction optical member so as to correct astigmatism based on a detection result of the interference light obtained by the interference optical system.

This application relates to ophthalmic lenses for use in the eye. The ophthalmic lens includes an anterior surface, a posterior surface, an optical center, and an optical region surrounding the optical center. The optical region includes a basic prescription for the eye and multiple non-refractive features; wherein the basic prescription includes spherical correction, astigmatism correction, or spherical and astigmatism correction. The non-refractive features contribute to increased retinal ganglion cell activity in the wearer, which can serve as an optical stopping signal to slow, improve, control, inhibit, or reduce the rate of myopia progression in the wearer.

The invention relates to the technical field of electrowetting cylindrical lens optical systems, and discloses an astigmatism correction and imaging optimization method for an electrowetting cylindrical lens optical system, and the method comprises the steps: obtaining the structure parameters and imaging environment parameters of the electrowetting cylindrical lens optical system, and determining a target imaging state; generating voltage driving signals including voltage amplitude, phase difference and driving frequency based on an astigmatism correction model, and performing real-time regulation and control on the electrowetting cylindrical lens; a self-adaptive optical compensation structure is adopted to adjust the system in real time, and axial and radial astigmatism errors are effectively corrected; the system monitors an imaging quality index in real time, and adjusts parameters of a voltage driving signal when detecting that the system deviates from a target state, such as adjusting voltage amplitude, phase difference or driving frequency, so as to realize adaptive astigmatism correction and imaging quality optimization. The astigmatism correction capability and the imaging stability of the electrowetting cylindrical lens optical system are effectively improved.

Provided are an astigmatism correction method of an electron beam imaging device, a product and an apparatus. The astigmatism correction method includes: searching a target astigmatism parameter of a stigmator in the electron beam imaging device; gradually adjusting a preadjustment objective lens current according to a set step size, and collecting a plurality of fine focused images corresponding to different objective lens currents; calculating gradients of the plurality of fine focused images in different coordinate axis directions; judging whether the target astigmatism parameter meets an astigmatism correction requirement according to consistency of the gradients; and if yes, determining a target objective lens current of the electron beam imaging device according to the gradients. Astigmatism correction accuracy is improved, and the problem that measurement accuracy is low due to application of an error astigmatism correction result is avoided, thereby improving the measurement accuracy of the electron beam imaging device.

Systems and methods for variable astigmatism correction in a head mounted display are disclosed. An apparatus may include viewing optics. The viewing optics may include a first rotatable phase plate, a second rotatable phase plate, and an adjustable focus device. The viewing optics may be configured to image light from the display, the imaged light having a spherical power, a cylindrical power, and a cylindrical axis. The spherical focal power, the cylindrical focal power and the cylindrical axis of the imaging light can be controlled by adjusting the adjustable focal length device, rotating the first rotatable phase plate and rotating the second rotatable phase plate. Other apparatus, devices, systems, and methods of manufacture are also disclosed.

Provided are a multi-charged particle beam mapping device and an adjustment method thereof that can easily and accurately correct astigmatism of multiple beams. The multi-charged particle beam mapping device includes: an objective lens for adjusting the focal position of the multiple beams; an astigmatism correction element for correcting the astigmatism of the multiple beams; an inspection aperture for passing one of the multiple beams; a deflector for deflecting the multiple beams and scanning the multiple beams across the inspection aperture; a current detector for detecting the beam current of each of the multiple beams after passing through the inspection aperture; a beam image generator for generating a beam image based on the beam current; a feature quantity calculator for summing the brightness of the beam images in a first direction to generate a first waveform and calculating a first feature quantity based on the first waveform; summing the brightness of the beam images in a second direction different from the first direction to generate a second waveform and calculating a second feature quantity based on the second waveform; and a parameter calculator for calculating an excitation parameter to be set for the astigmatism correction element based on the first and second feature quantities.

A system, method, and apparatus for guiding an astigmatism correction procedure on an eye of a patient are disclosed. An example apparatus includes a photosensor configured to record a pre-operative still image of an ocular target surgical site of the patient. The apparatus also includes a real-time, multidimensional visualization module configured to produce a real-time multidimensional visualization of the ocular target surgical site during an astigmatism correction procedure. The apparatus further includes a data processor configured to determine a virtual indicium that includes data for guiding the astigmatism correction procedure. The data processor uses the pre-operative still image to align the virtual indicium with the multidimensional visualization such that the virtual indicium is rotationally accurate. The data processor then displays the multidimensional visualization of the ocular target surgical site in conjunction with the virtual indicium.

An ophthalmic apparatus includes an interference optical system, an optical scanner controller, and a correction controller. The interference optical system includes an astigmatism correction optical member and an optical scanner, and is configured to split light from a light source into reference light and measurement light, to irradiate the measurement light onto the subject's eye via the astigmatism correction optical member and the optical scanner, and to detect interference light between returning light of the measurement light from the subject's eye and the reference light. The optical scanner controller is configured to control the optical scanner so as to deflect the measurement light in a horizontal direction and a vertical direction on a plane perpendicular to an optical axis of the interference optical system. The correction controller is configured to control the astigmatism correction optical member so as to correct astigmatism based on a detection result of the interference light obtained by the interference optical system.