41 results about "Corneal shape" patented technology

A method and material for augmenting the shape and thickness of the cornea in situ includes applying a clear liquid collagen mixed with a customized crosslinker onto the augmentation surface or in a cavity (with or without a mold) and exposing the mixture to UVA radiation in vivo. Application of UVA at varying dosages demonstrate progressive optically clear gelation and biomechanical adherence properties, and in vitro optical properties (RI), mechanical suture strength and rheometric parameters are comparable to native corneal stromal tissue. Photochemical corneal collagen augmentation according to the invention makes it suitable to reconstruct and strengthen diseased and damaged eyes, ulcerated corneas, as well as provide a substrate for refractive onlay / inlay procedures and lamellar transplantation.

A shape change is induced in a cornea for treating a keratoconus condition, and / or correcting a refractive error and / or a high order aberration. A beam of laser pulses is focused to a stromal layer of a patient's eye, and an intrastromal pocket is ablated. An injection port is cut between the intrastromal pocket and a cornea surface of the eye. A polymerizable fluid is flowed into the intrastromal pocket through the injection port. The fluid is cured to form a polymeric insert, and thereby inducing a cornea shape change.

The present invention provides methods for measuring corneal characteristics and distortions to determine one or more appropriate designs for one or more corrective lenses used to reshape the cornea of an eye. The method includes measuring and / or mapping the topology of the cornea, identifying a desired new shape for the cornea, comparing the current shape of the cornea to the desired shape, and configuring one or more corrective lenses to apply force to the cornea to change its shape. The process of measuring and / or mapping, comparing, and configuring may be repeated until the cornea takes on the desired shape.

Methods, software, and systems are provided for determining an ablation target shape for a treatment for an eye of a patient. Techniques include determining wavefront information from the eye of the patient with a wavefront eye refractometer, determining anterior corneal shape information from the eye with a corneal topography device, and combining the wavefront information and the anterior corneal shape information to determine the ablation target shape.

A method of determining a corneal thickness and an apparatus for determining the same. The method comprises the following steps of illuminating a cornea by a plurality of stimulator point light sources, capturing an image of the cornea comprising reflected images of the stimulator point light sources, obtaining a first model representing an anterior surface of the cornea, constructing a second model representing a posterior surface of the cornea from the image by ray-tracing the reflected images of the stimulator point light sources towards the first model representing the anterior surface of the cornea, and determining the corneal thickness from the first model representing the anterior surface and the second model representing the posterior surface.

The invention provides a contactless tonometer. In a contactless tonometer having a mechanism of puffing compressed air by moving a piston in a cylinder, puffing of unnecessary air against the eye to be inspected is suppressed. An apparatus includes a corneal shape changing unit configured to change a shape of a cornea of an eye to be inspected by compressing air in a cylinder by using a piston, and puffing the compressed air from the nozzle to the cornea, a piston control unit configured to control operation of the piston, and an intraocular pressure measurement unit configured to measure an intraocular pressure of the eye by detecting a state of a changed shape of the cornea. This apparatus includes a piston volume changing unit configured to change an initial volume when the piston compresses the air in the cylinder.

The invention discloses an orthokeratology lens cleaning instrument, which comprises a base, a plastic cover fixed on the base, a lithium battery fixed on the upper end of the plastic cover, an operation interface fixed on the plastic cover, Two micro-vacuum pumps on the base, cleaning fluid on the plastic cover, magnetic module on the plastic cover, two stepping motors on the magnetic module, two stepping motors respectively The two orthokeratology lens clips on the top, the two cleaning nozzles on the side wall of the plastic case, the sewage tank that is movable on the base, the sewage baffle fixed on the sewage tank, and the sewage baffle on the base. Fixtures for securing it.

Methods of correcting vision for presbyopia, including remodeling a stroma with a laser to create an intracorneal shape, where the corneal shape includes a central region with a thickness that is about 50 microns or less measured from an extension of a shape of a peripheral region of the corneal shape, wherein remodeling a portion of the stroma increases a curvature of a central portion of the anterior surface of the cornea with a central elevation change for near vision.

In a non-contact tonometer, puffing of air unnecessary for measurement of an eye to be inspected after driving of a solenoid is stopped is suppressed. In the non-contact tonometer including a corneal shape change unit configured to change the shape of the cornea by pressurizing and supplying a gas in a cylinder by a piston, and an eye pressure measuring unit configured to measure the eye pressure from the state of the shape change of the cornea, an opening portion configured to be formed in the outer wall of the cylinder and decide the internal volume of the cylinder when pressurizing the gas, and a pressurized gas volume change unit configured to change a position where the opening portion can connect the inside of the cylinder with the outside, and change the internal volume of the cylinder when pressurizing the gas.

The present invention provides a myopia and / or astigmatism-correcting contact lens for correcting myopia and / or astigmatism based on the alteration in the shape of a patient's cornea. The myopia and / or astigmatism-correcting contact lens comprises a pressure zone having a first surface defined by the inner surface of the contact lens located on the side of the patient's cornea and positioned at the center of the contact lens. The first surface is formed in a concave shape having a curvature less than that of the central surface of the patient's cornea. The contact lens further includes a relief zone having a concave-shaped second surface defined by the inner surface of the contact lens located on the side of the patient's cornea and positioned at the periphery of the pressure zone, and an anchor zone having a concave-shaped third surface defined by the inner surface of the contact lens on the side of the patient's cornea and positioned at the periphery of the relief zone. The first surface has a curvature determined based on the shape of the patient's cornea to induce a specific desired alteration in the shape of the patient's cornea. Further, each of the curvatures of the first, second and third surfaces is arranged to satisfy the following formulas,RC=BC+7.0˜9.0 D (diopter), andAC=BC+2.0˜4.0 Dwhere BC is the curvature of the first surface, RC is the curvature of the second surface, and AC is the curvature of the third surface.

There is provided an ophthalmologic apparatus which can be effectively used for the clinic of a dry eye by using, as a basic principle, that when a tear film dries up, a corneal shape is changed and / or a wavefront aberration becomes large. When a measurement is started, the ophthalmologic apparatus is aligned. An arithmetic part performs an initial setting of a measurement interval of the apparatus, a measurement time and the like by a wavefront measurement part. An input part or the arithmetic part triggers a measurement start, and the arithmetic part repeats a measurement of the corneal shape and corneal wavefront aberrations by a measurement part until time reaches a measurement end time. When the time reaches the measurement end time, a judgment part analyzes a breakup state as one index for judgment of a state of a dry eye. The judgment part obtains values relating to the breakup to output them, and performs an automatic diagnosis about dry eye on the basis of the values.

An excessive amount of pressurized air is inhibited from being blown to an eye of a patient during measurement of a corneal shape deformation amount. In a non-contact tonometer having a piston, a driving unit to drive the piston, a fluid ejection unit to blow air pressurized by driving the piston toward a cornea of an eye to be inspected, and an intraocular pressure measuring unit to detect a deformed state of the cornea and measure an intraocular pressure, there are provided a piston displacement restricting unit that restricts a displacement amount when the piston pressurizes the air, and a changing unit to change the displacement amount to be restricted by the piston displacement restricting unit.

A jig and a cooling fluid injection tool are provided for use in the correction of corneal shape of an eyeball. Correction of the eyeball takes place while the cornea is warmed. The jig includes a shape retention part of a sucking disc configuration having an inner surface side that contacts the eyeball and a grip part formed on an outer surface side of the shape retention part. An inner surface-sided cornea contacting section of the shape retention part is flattened and a cooling fluid injection hole passing through the grip part is formed in the center of the shape retention part with a diameter large enough for a wearer to see outside.

Methods of correcting vision for presbyopia, including remodeling a stroma with a laser to create an intracorneal shape, where the corneal shape includes a central region with a thickness that is about 50 microns or less measured from an extension of a shape of a peripheral region of the corneal shape, wherein remodeling a portion of the stroma increases a curvature of a central portion of the anterior surface of the cornea with a central elevation change for near vision.

The invention provides a dryer for maintaining the cornea shape and belongs to the field of corneal shape maintenance. The dryer comprises a sealed working box, the sealed working box comprises a circulating fan, a circulating air duct, a dust filter screen, a drying box, a fixed platform surface, a first ultraviolet lamp tube and a renewable moisture absorber arranged sequentially in the sealed working box, a primary effect filtering sponge is arranged in the circulating fan, and positioning holes and an air vents are arranged in the drying box, 304 stainless steel beads are arranged the positioning holes for placing the cornea, and a second ultraviolet lamp tube and an air outlet are arranged on the inner wall of the sealed working box. In the invention, the positioning holes are arranged in the dryer for placing the 304 stainless steel beads, and a cornea sample is placed on the 304 stainless steel bead during drying, thereby better maintaining the cornea shape and solving the problem of shrinkage and deformation of the cornea sample in the drying process.

The present application discloses a method, device, equipment and readable storage medium for fitting orthokeratology lenses. The method includes the steps of: acquiring eye characteristic parameters; inputting the eye characteristic parameters to preset orthokeratology fitting glasses Algorithm model to obtain the orthokeratology spectacle parameters; the preset orthokeratology spectacle algorithm model is a plurality of target machine learning models whose accuracy rate is greater than the preset accuracy rate in the preset algorithm library; the orthokeratology The lens parameter is the harmonic average value corresponding to the plurality of target machine learning models; output the prescription order corresponding to the orthokeratology lens fitting parameter to the preset fitting device, so as to control the preset fitting device based on the Dispensing orthokeratology lenses according to the prescription instructions above. This application improves the accuracy of orthokeratology glasses, avoiding inaccurate or inefficient fitting of orthokeratology lenses by doctors (or optometrists) due to inexperience, and the preset orthokeratology algorithm model itself The accuracy rate is not high, which leads to the problem of low accuracy of orthokeratology lens dispensing.