12 results about "Corneal vertex" patented technology

The application belongs to the technical field of ophthalmic medical instruments, and provides a corneal topography measurement method, an instrument, an electronic device and a program product, the corneal topography measurement method obtains the corneal diameter and the corneal vertex of the eye cornea of a detected object; determines the distance between the corneal vertex and the vertex of a Placido disc, determines the eccentricity of the Placido disc; determines the shape of the Placido disc according to the eccentricity of the Placido disc, and determines the ring number of the Placido disc according to the corneal diameter; collects the corneal topography imaging after the concentric ring on the Placido disc is reflected on the corneal surface of the detected object; based on the shape and the ring number of the Placido disc, analyzes a plurality of concentric rings contained in the corneal topography imaging, and obtains the corneal topography data of the detected object. The accuracy of measuring the corneal topography is improved, so that the micro-landscape features of the corneal surface can be more accurately obtained.

The invention discloses an automatic eyeball protrusion measuring device, belongs to the technical field of eyeball measurement, and aims to solve the problems that when an eyeball protrusion measuring device is used, an operator needs to manually calibrate and position, meanwhile, holding angles and supporting leg fitting forces of different operators are different, and eye socket forms of a patient have individual characteristics, so that the use difficulty of the eyeball protrusion measuring device is lowered. The device comprises a fixing frame, a controller is arranged on one side of the fixing frame, a rubber pad is fixedly connected to the other side of the fixing frame, an elastic connecting assembly is arranged on one side of the fixing frame, and a visual detection assembly is arranged in the fixing frame. The distance data between the cornea vertex and the orbital lateral edge can be collected in a non-contact detection mode, the difference calculation function of the controller is combined, the eyeball protrusion value is automatically output, and the manual reading error is reduced.

The application provides a center positioning system for femtosecond laser ophthalmic corneal refractive surgery, which comprises an iris recognition component, a central processing component and a real-time display component, the iris recognition component is used for converting a real-time image of a patient into a digital image; the central processing component is electrically connected with the iris recognition component, and the central processing component is used for converting the digital image into an iris simulation image with a size equal to that of a pre-recorded patient examination iris image; the real-time display component is electrically connected with the central processing component, is used for receiving the iris simulation image transmitted by the central processing component, and presents the iris information transmitted by the central processing component in real time. Meanwhile, a center positioning method is also provided, which takes the corneal vertex as the center, calculates the self-rotation angle of a treated eye of a patient by comparing the image angle difference between the iris simulation image and the pre-recorded real-time image, improves the positioning accuracy, significantly reduces the residual myopia and astigmatism, and improves the safety of the ophthalmic femtosecond laser surgery.

This application discloses a personalized wavefront compensation method, system, computer device, and storage medium based on the wearing geometry optical path. The method includes: acquiring prescription parameters, geometric parameters, and individualized ocular physiological parameters including corneal anterior surface morphology data of the wearer's eyeball; constructing a vector tracing model containing the dynamic trajectory of the corneal apex and the posterior surface of the lens, with the eyeball rotation center as the origin; inputting the geometric parameters into the model for ray tracing to calculate the distortion phase distribution; generating a personalized wavefront compensation term based on the distortion phase distribution; fusing the compensation term with the basic phase field corresponding to the prescription parameters to obtain a fused phase field; performing a conformal mapping transformation on the fused phase field to obtain a planarized customized phase distribution; and generating height field data for driving micro / nano manufacturing processes based on the planarized customized phase distribution. This application solves the technical problem of planar lenses being difficult to match in three-dimensional wearing states, achieving wavefront compensation that accurately matches actual wearing conditions.

A positioning device for an optical axis and a corneal vertex comprises a measuring base and two sets of measuring suites. The measuring base is provided with two base through holes, and the two sets of measuring suites are oppositely arranged in the left-right direction. The measuring suite comprises a first measuring plate, a second measuring plate, a measuring ball and a measuring tube, the first measuring plate and the second measuring plate are adjustably arranged on the measuring base corresponding to the base through hole, and the first measuring plate is arranged in front of the second measuring plate at an interval; a first measuring through hole and a second measuring through hole are formed in the front face of the first measuring plate and the front face of the second measuring plate respectively, the measuring ball is rotatably arranged on the front face of the measuring base, the outer side wall of the measuring pipe is connected to the measuring ball, and the measuring ball rotates to drive one end of the measuring pipe to point to the rear portion of the second measuring through hole. In conclusion, the positioning device provided by the utility model can accurately and intuitively position the visual axes and corneal vertexes of the two eyes of the person who puts the glasses, so that the visual axis distance and the glasses-eye distance of the two eyes of the person who puts the glasses are measured, and the accuracy of doing the glasses according to the measurement result is high.

Provided herein are a method and device for laser ray tracing measurement of intraocular distances and structures. Generally, the device has a laser, pairs of acousto-optical deflectors, drivers, frequency generators, and beam splitters, a telescope and collimating lens, a basic optometric channel and a processing unit arranged and configured to probe an eye with modulated laser beams oriented to cross along optically determinable paths. Analysis of the detectable backscattered radiation is used to confirm the position of a beam cross-point and to calculate the distance thereof to an apex of the cornea. Data obtained from repeated probing is used to reconstruct the intraocular structure of the eye.

A method for finding an optical axis position prior to eye docking for use in a corneal microlens procedure for tracking optical axis position displacement during docking without ink marking the optical axis position at the center of the cornea using ink or other material, and centering the microlens cutout pattern at the viewing axis position after docking. The two docking illumination beams illuminate on the surface of the eye at an inclined angle and a first eye image is taken before docking while the eye gazes at the fixed light of the laser system. A second eye image is taken after docking. Corneal vertex positioning before docking is obtained based on the two reflected light spots of the docking illumination light. A pupil center is obtained in both images. The post-docking corneal apex is then calculated from the pre-docking corneal apex positioning and the pre-docking and post-docking pupil center positioning.

The application discloses an ophthalmic measurement optical system for measuring the corneal vertex curvature of a human eye, comprising an objective lens, an imaging lens, a camera device and a light source assembly, wherein the light source assembly, the imaging lens and the camera device are sequentially arranged on the side of the objective lens away from the human eye, the light source assembly comprises a plurality of light sources, the light emitted by the light sources is transmitted through the objective lens, is incident on the human eye, is reflected by the cornea of the human eye, is transmitted through the objective lens again, and is received by the camera device. The ophthalmic measurement optical system improves the measurement accuracy of the corneal curvature.

A method and apparatus for laser ray tracing measurements of intraocular distances and structures are provided herein. Generally, the device has a laser, a pair of acousto-optic deflectors, a driver, a frequency generator and beam splitter, a telescope and collimating lens, a base optometric channel and a processing unit, and is arranged and configured to detect the eye with a modulated laser beam oriented to intersect along an optically determinable path. Analysis of detectable backscattered radiation is used to confirm the position of the beam intersection and to calculate its distance to the corneal vertex. The data obtained by repeated probing is used to reconstruct the intraocular structure of the eye.

The invention provides a high-precision three-dimensional cornea vertex positioning method and system based on image analysis, and belongs to the technical field of image processing, and the method specifically comprises the following steps: determining a positioning processing result of a three-dimensional cornea vertex by using a positioning processing method, so as to determine the three-dimensional cornea vertex in different users; on the basis of the deviation condition of positioning processing results among different positioning processing methods, multiple positioning demand features in cornea image features are determined, and available matching combinations in user combinations are determined according to positioning processing data of the multiple positioning demand features; and determining an optimization processing strategy of the three-dimensional cornea vertex of the user according to the positioning processing data of the three-dimensional cornea vertex when it is determined that optimization processing of the positioning processing strategy needs to be carried out by combining the positioning processing data of the user and the multi-positioning demand feature data of different positioning verification processing methods. And the positioning processing accuracy of the cornea vertex is improved.

Apparatus and methods for eye tracking using an optical coherence tomography (OCT) device are disclosed. Such eye tracking may be performed by using information about the shape of the cornea and the corneal apex or using the iris / pupil border obtained using the OCT device.

The invention belongs to the technical field of ophthalmology department clinical medical treatment, and relates to an OCT automatic alignment method and system based on multi-path fusion. The method comprises binocular vision coarse positioning, front camera Michael ring center fine alignment, OCT image fine alignment and multi-path data fusion. The system comprises a binocular detection positioning module, a front camera Michael ring center extraction module, an OCT cornea vertex extraction module, a three-dimensional motion execution mechanism and a multi-source data fusion control unit. Through the binocular vision, Michael ring image and OCT cornea vertex three-way collaborative multi-source fusion technology, full-process automation from coarse positioning to submillimeter-level fine positioning is achieved, and the system performance and the use experience are remarkably improved.