10 results about "Anterior cornea" patented technology

The present invention provides a goniolens and gonioscopy tool that can be freely moved on the cornea, thereby allowing for easy adjustment of the viewing angle and direction. [Solution] The goniolens 1 comprises a convex aspherical portion 2 that partially contacts the cornea 11, and a convex spherical portion 3 provided on the opposite side of the aspherical portion 2 for observing the iridocorneal angle 12 through the aspherical portion 2. The iridocorneal angle observation device 6 comprises the goniolens 1 and a holder 5 that holds the goniolens 1.

The application relates to a corneal drug delivery scleral lens, which comprises a lens body, the lens body comprises a treatment area, a reverse area and a landing area from the center to the outside, the treatment area is located in the center, the reverse area is arranged around the treatment area and is used for connecting the treatment area and the landing area, the landing area is arranged around the reverse area and is used for supporting a scleral surface, so that a liquid accumulation layer is formed between a corneal front surface and the lens body; a flow guide pipe is arranged in the lens body in the radial direction, forming a liquid injection end and a drug delivery hole. The scleral lens of the application can supplement liquid medicine through the flow guide pipe without taking off the lens, dynamic fluid replacement is realized, and the cornea is prevented from being damaged by repeated taking off and wearing. When the lens is designed, the height of the reverse area is taken as a core variable parameterization design, the thickness of the liquid accumulation area and the drug concentration are accurately controlled. The overflow hole is normally sealed, and the risk of infection is reduced. The liquid medicine is diffused from the edge to the center, the whole surface of the cornea is uniformly soaked, and the bioavailability is improved.

The embodiment of the invention provides an optical lens. The optical lens comprises a first lens group, a diaphragm and a second lens group which are sequentially arranged along the same optical axis. The first lens group comprises a first lens and a second lens which are arranged along the optical axis, and the second lens is positioned on one side close to the diaphragm; the second lens group comprises a third lens, a fourth lens, a fifth lens and a sixth lens which are arranged along the optical axis, the third lens is located on the side close to the diaphragm, and the sixth lens is located on the side away from the diaphragm; the first lens comprises a first surface far away from the diaphragm and a second surface close to the diaphragm, the curvature radius of the first surface is the same as that of the front surface of the cornea of the human eye, and the curvature radius of the second surface is the same as that of the rear surface of the cornea of the human eye.

The invention provides a corneal curvature determination method and device for intraocular lens degree calculation of an eye after an LASIK operation and electronic equipment, and relates to the technical field of medical data processing, and the corneal curvature determination method comprises the following steps: obtaining a corneal topographic map; extracting data points of the axial curvature of the front surface of the cornea based on the corneal topographic map, and screening out all curvature data points in a first diameter circular area from the data points of the axial curvature of the front surface of the cornea; calculating a curvature average value of two intersection points of the flat axis and the edge of the target area as a flat axis diopter, and calculating a curvature average value of two intersection points of the steep axis and the edge of the target area as a steep axis diopter; based on the steep axis diopter and the flat axis diopter, the intraocular lens degree of the LASIK postoperative eye is calculated. According to the method, the axial curvature data of the front surface of the cornea is smoothed, a K value calculation method is improved based on delimitation of a target area and an effective optical area, and system errors of IOL calculation are reduced.

Various embodiments are presented for a method of wide-field self-referenced interference for OCT imaging, that allows for a focus on the cornea over a large diameter while reducing the number of artifacts in the signal. To accomplish this, the method includes operating a super luminescent diode to emit a light, using that light to illuminate an interferometer, collimating the light, and coupling the collimated light to an optical scanner and lens to produce a probing beam. The method also includes directing the beam through the lens onto the anterior corneal surface of the cornea and creating an incident angle between the probing beam and the anterior corneal surface. Finally, the method includes using the lens to ensure the beam is perpendicular to the corneal surface with the incident angle at less than two degrees, focusing from the center to the periphery of the corneal surface, aligning the beam with the reflective corneal surface to generate a self-referencing signal, and using the self-referencing signal to generate self-referenced interference. The self-referenced interference is detected with a spectrometer to generate a high-resolution image of the cornea over a large diameter while reducing the number of reflection artifacts experienced in typical OCT system. Additionally, a hybrid dual-path and self-referenced imaging method is disclosed in which an optical shutter in the reference arm enables sequential acquisition of conventional OCT and localized self-reference apex imaging, followed by fusion into a composite artifact-free OCT image.

This invention provides an animal eye imaging method, apparatus, and electronic device based on SS-OCT. The method involves scanning the eye of a target animal using SS-OCT to acquire three-dimensional volumetric data of a designated region of the eye. The designated region includes at least the area from the anterior corneal surface to the retina. An imaging result of the animal eye is generated based on the three-dimensional volumetric data, and the imaging result includes at least one imaging data morphology. This method uses three-dimensional volumetric data as a unified geometric reference to generate at least one imaging data morphology of the animal eye, thereby achieving accurate imaging of the animal eye.

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.

This application relates to a method and apparatus for determining corneal axial curvature. The method includes: acquiring the anterior corneal surface layering line and / or posterior corneal surface layering line for each of multiple corneal images of a target cornea; determining the axial position of the target cornea based on the anterior and / or posterior corneal surface layering lines of each corneal image; and determining the axial curvature of the target cornea based on the axial position of the target cornea. This method, by introducing the axial position of the cornea, and thus determining the axial curvature of the cornea based on the axial position, achieves the effect of accurately calculating the corneal axial curvature even when the scanning center is not on the axial direction due to systematic errors.

The embodiment of the invention discloses a layered measurement method for polarization parameters of a cornea anterior surface structure and a related device, and the method comprises the steps: obtaining the polarization parameters of a cornea under the configuration parameters of each light cutting band, and the polarization parameters comprise a phase delay map and a fast axis direction map; the phase delay map is used for representing the change of a phase delay parameter along with the position, and the fast axis direction map is used for representing the change of a fast axis direction parameter along with the position; fusing the plurality of phase delay maps under the light-cut band configuration parameters based on a hierarchical weight fusion strategy to obtain a phase delay map dominated by the cornea anterior surface structure, and fusing the plurality of fast axis direction maps under the light-cut band configuration parameters based on a loop statistical strategy to obtain a phase delay map dominated by the cornea anterior surface structure. And obtaining a fast axis direction map dominated by the cornea anterior surface structure. The measurement result obtained by the embodiment of the invention can more truly reflect the collagen arrangement state of the cornea anterior elastic layer and the superficial layer matrix, and the reliability of the method in fine diagnosis is remarkably improved.

Systems and methods described herein provide improved techniques for segmenting a corneal epithelial layer. One method includes receiving an optical coherence tomography (OCT) image of an eye, generating a binarized image of the eye based on the OCT image, generating a binary mask of a cornea of the eye based on the binarized image of the eye and the OCT image, segmenting an anterior cornea of the eye on the OCT image based on the binary mask of the cornea of the eye, generating a binary mask of an epithelial layer of the eye based on the OCT image and the segmented anterior cornea of the eye, segmenting a Bowman's layer in the cornea of the eye on the OCT image based on the binary mask of the epithelial layer of the eye, and making the segmented anterior cornea and the segmented Bowman's layer data available for generating an epithelial map.