13 results about "Corneal shape" patented technology

The invention discloses an orthokeratology lens fitting method and system, portable shooting equipment and electronic equipment. According to the method, the lens parameters are dynamically optimized in real time, and the problem of adaptation deviation caused by cornea morphological change in traditional fitting is directly solved. A continuous adjustment mechanism of lens radian and pressure distribution can accurately match biomechanical characteristics of the cornea of a patient, and local compression or insufficient correction caused by long-term wearing is avoided. The adaptive capacity remarkably improves the fitting degree of the lens and the cornea, the vision correction effect is more stable, meanwhile, the eye discomfort risk caused by fixed parameters is reduced, the intelligent dynamic parameter optimization engine combines professional judgment of doctors with an automatic algorithm, and the intelligent dynamic parameter optimization engine is more efficient. Therefore, the fitting process is converted into a continuous tracking dynamic closed loop from a single static operation. A doctor can check a parameter adjustment track in real time through the cloud platform and quickly confirm an optimization scheme, so that the time cost of manual repeated measurement and calculation is reduced.

Systems and methods are disclosed to enable detection of excessive contact lens shift in a head-mounted display (HMD) device that implement gaze tracking for the user. In embodiments, during a user enrollment process to calibrate the gaze tracking system, the HMD device analyzes key frames of the eye to estimate a first center location of the eye based on detected eye features such as the pupil, the iris, or the limbus, and a second center location of the eye based on the shape of the detected cornea. Shift vectors are generated based on the two center locations for individual key frames. If the standard deviation of the vectors' magnitudes exceeds a specified threshold, excessive lens shift is detected. In response to detection of excessive contact lens shift, the HMD device may generate a notification to the user or activate compensation mechanisms.

The invention relates to the field of ophthalmology medical treatment, and discloses a cornea compression molding device for astigmatism surgical correction. According to the device, a circular ring body is fixedly arranged on the cornea of an eyeball in a sleeving manner, and a ring body connecting handle is connected to the surface of one side of the circular ring body; the upper surface of the circular ring body is provided with scales for referring to the axial direction of astigmatism, visual reference is provided for axial calibration of the astigmatism, and it is ensured that the arc piece can be accurately aligned with the target axial position. The circular ring body is matched with the cornea in size, the positioning cylinder provides a reference for horizontal positioning of the cornea, it is guaranteed that the compression molding direction is accurate, stable supporting is provided for the whole device, and it is guaranteed that the device does not deviate in the compression molding process; the compression molding arc sheet is a compression molding part directly acting on the cornea, and the cornea form is changed through physical extrusion; the pressure adjusting knob is used for accurately adjusting and controlling compression molding pressure; the ring body is connected with the handle so that a doctor can hold conveniently.

This application relates to a femtosecond laser multi-degree-of-freedom personalized reshaping method and system for intracorneal implants, belonging to the field of femtosecond laser processing technology. Utilizing the cold processing characteristics of femtosecond lasers, the intracorneal implant is individually cut and ablated to obtain the desired three-dimensional corneal shape, precisely shaping the curvature, thickness, and contour of the lens to perfectly match the patient's corneal capsule or lesion area. By leveraging the nonlinear optical effect induced at the focal point of the femtosecond laser, the stromal collagen network in the weak areas corresponding to corneal expansion can be densified through laser processing, significantly improving the local elastic modulus and resistance to deformation. In areas requiring a smooth transition with the recipient cornea or adjustment of refractive power, controllable micropores or low-density areas can be induced, appropriately reducing local stiffness, thereby achieving a spatial gradient distribution of internal mechanical properties and customizing the overall mechanical behavior and morphological stability after implantation.

To illuminate a pattern index more uniformly without complicating the composition.SOLUTION: An ophthalmologic apparatus for measuring a cornea shape of an eye to be examined includes a measurement pattern index plate where a pattern index for measuring a cornea shape of an eye to be examined, and a flat surface light emission panel for illuminating the measurement pattern index plate from behind and projecting the pattern index onto the cornea of the eye to be examined. The surface light emission panel includes a light guide plate for guiding light, an illumination light source arranged at an end part of the light guide plate, and a reflection pattern arranged on a rear surface side of the light guide plate for reflecting the light from the illumination light source on a front surface side of the light guide plate. The density of the reflection pattern is adjusted in correspondence with a positional relationship between the surface light emission panel and the pattern index.SELECTED DRAWING: Figure 2

The invention relates to a method for producing an implant to be inserted into the cornea of an eye (3) for correcting defective vision, comprising the steps of: a) providing defective vision data concerning the defective vision of the eye to be corrected; b) determining a change in shape of the cornea necessary for correcting the defective vision on the basis of the defective vision data; and c) defining a profile of a thickness of the implant such that the insertion thereof into the cornea brings about the desired defective vision correction, a proportion to which the thickness of the implant changes the shape being determined, the proportion being between zero and one.

An ophthalmic apparatus of an aspect example includes an image acquiring unit, a corneal shape estimating processor, and a first image correcting processor. The image acquiring unit is configured to acquire an anterior segment image constructed based on data collected from an anterior segment of a subject's eye by optical coherence tomography (OCT) scanning. The anterior segment image includes a missing part corresponding to a part of a cornea. The corneal shape estimating processor is configured to estimate a shape of the missing part of a cornea image by analyzing the anterior segment image acquired by the image acquiring unit. The first image correcting processor is configured to correct distortion of the anterior segment image based at least on the shape of the missing part estimated by the corneal shape estimating processor.

To provide an ophthalmic device that can measure corneal shape without increasing the subject's discomfort due to glare. [Solution] An ophthalmic device for measuring the corneal shape of an eye under examination, comprising: a first projection optical system that projects a first pattern indicator onto the cornea of ​​the eye under examination using invisible light; a second projection optical system that projects a second pattern indicator onto the cornea of ​​the eye under examination using visible light; an anterior segment imaging optical system that receives reflected light from the anterior segment of the eye under examination; and a control unit, wherein the control unit analyzes and processes imaging data obtained by receiving the reflected light of the first pattern indicator projected onto the cornea of ​​the eye under examination by the first projection optical system with the anterior segment imaging optical system to determine whether or not corneal shape measurement of the eye under examination can be performed, and if it is determined that corneal shape measurement is possible, the second projection optical system projects a second pattern indicator onto the cornea of ​​the eye under examination, and analyzes and processes imaging data obtained by receiving the reflected light of the second pattern indicator with the anterior segment imaging optical system to measure the corneal shape.

The present invention relates to the technical field of orthokeratology lenses based on big data elliptical models, and in particular to an orthokeratology lens based on a big data elliptical model. The orthokeratology lens based on the big data elliptical model significantly improves the fit between the lens and the cornea by designing a positioning arc area that fits the patient's cornea more closely, thereby improving the wearing comfort and stability of the lens. Compared with the traditional design method based on the average curvature of the junction point, the virtual elliptical model provides a continuously changing curvature calculation of the positioning arc area, so that the lens design is more in line with the actual corneal shape and thus better matches the patient's cornea. In addition, since the design can obtain a preset eccentricity value based on the patient's corneal radius, the optometrist can accurately fit the glasses without additional knowledge or operation, avoiding the problem of inaccurate or low efficiency of orthokeratology lens fitting due to lack of experience of doctors (or optometrists), thereby improving the fitting efficiency, accuracy and wearing comfort of orthokeratology lenses.

It describes a method for producing an implant to be inserted into the cornea of ​​an eye (3) for the purpose of correcting refractive errors, comprising the steps a) Providing refractive error data about the refractive error of the eye to be corrected, b) Determining the necessary corneal shape change to correct the refractive error based on the refractive error data, c) Defining a lateral course of the thickness of the implant such that its insertion into the cornea produces the desired refractive error correction, whereby a proportion is determined to which the thickness of the implant changes the shape of the front of the cornea, wherein the proportion is between zero and one.

The present application relates to a kind of intelligent tear film biomimetic generator, including generator body, the generator body includes upper body and lower body, the upper body is provided with upper chamber, lower body is provided with lower chamber, the membrane structure is sealingly arranged between the lower chamber and upper chamber, the lower chamber is provided with the culture solution flow circulation system for adjusting the pressure in lower chamber, so that the corneal shape of tissue engineering cornea is formed and is raised upwards, the upper chamber is provided with the drop intelligent dispersion system simulating tear film rupture.The present application is used by the combination of drop intelligent dispersion system and culture solution flow circulation system, for the first time realizes the simulation of tear film generation this physiological process, to realize the physiological environment of overall simulation corneal surface, it provides the possibility for the proliferation cultivation cornea related cell, and by data control analysis and summary, for improving the quality of tissue engineering cornea provides reliable guarantee.The present application can also be used for the research of tear film related physiology and pathophysiology mechanism.

The invention discloses an orthokeratology lens design method, device and equipment and a storage medium, and belongs to the field of orthokeratology lens design. The method comprises the steps that firstly, measurement data including diopter and corneal morphology are acquired, and if the diopter and the corneal morphology meet a first judgment condition, the orthokeratology lens is determined to be the orthokeratology lens; if yes, geometric parameters of the orthokeratology lens are designed based on a continuous aspheric surface design method and the measured data, otherwise, the geometric parameters are designed based on a double inverse geometric design method and the measured data, and finally the geometric parameters of the orthokeratology lens are output. Therefore, by means of the orthokeratology lens design method, the problem that the presbyopia correction effect is poor in the current orthokeratology lens design method can be solved.

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.