43 results about "Corneal shape" patented technology

An ophthalmic surgical microscope comprises: an observation optical system for observing a patient's eye during surgery; a corneal shape measuring unit for measuring a corneal shape of the patient's eye placed in a surgical position; and a controller configured to output guide information for guiding a surgery with an intraocular lens based on a measurement result obtained by the corneal shape measuring unit to an output device.

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.

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 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.

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.

Systems, methods and apparatus for performing selective ablation of a corneal surface of an eye to effect a desired corneal shape, particularly for correcting a hyperopic / astigmatic condition by laser sculpting the corneal surface to increase its curvature. In one aspect of the invention, a method includes the steps of directing a laser beam onto a corneal surface of an eye, and changing the corneal surface from an initial curvature having hyperopic and astigmatic optical properties to a subsequent curvature having correctively improved optical properties. Thus, the curvature of the anterior corneal surface is increased to correct hyperopia, while cylindrical volumetric sculpting of the corneal tissue is performed to correct the astigmatism. The hyperopic and astigmatic corrections are preferably performed by establishing an optical correction zone on the anterior corneal surface of the eye, and directing a laser beam through a variable aperture element designed to produce a rectangular ablation (i.e., cylindrical correction) on a portion of the optical correction zone. The laser beam is then displaced by selected amounts across the optical correction zone to produce a series of rectangular ablations on the correction zone that increases the curvature of the corneal surface to correct the hyperopic refractive error.

A jig and a cooling fluid injection tool that are used in the correction of corneal shape conducted while the cornea of the eyeball is warmed and softened are provided. The vision corrective jig 1 comprises a shape retention part 2 of sucking disc configuration with its inner surface side contacting with the eyeball and a grip part 3 formed on the outer surface side of the shape retention part. The inner surface-sided cornea contacting section 2a of the shape retention part 2 is flattened and a cooling fluid injection hole 4 passing through the grip part 3 is formed in the center of the shape retention part 3. The cooling fluid injection hole 4 has a diameter being large enough for a wearer to see outside through the cooling fluid injection hole 4. The grip part 3 is integrally formed on the outer surface side of the shape retention part 2 in a button shape.

A closed-loop control system for altering the optical characteristics of a patient's cornea includes an algorithm for predicting the shape of the cornea after one or more gas bubbles resulting from intrastromal photoablation have collapsed. Patient data can be used as an input for the algorithm, which is then run to prepare an initial treatment plan for a corneal alteration. The initial plan typically includes a plurality of intrastromal photoablation locations and corresponding ablation energies. After photoablation of plan location(s) and before the resulting bubbles collapse, a real-time wavefront shape for light passing through the cornea is measured. The wavefront is then used in the algorithm to predict a post bubble collapse cornea shape and to generate an updated treatment plan. The procedure then continues by ablating location(s) identified in the updated treatment plan. Wavefront measurement and plan updating can be repeated as many times as desired.

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 cornea shape measurement apparatus outputs data useful for prescription as well as injection and installation of a TORIC-IOL. This apparatus includes: a projecting optical system projecting an index for measurement onto a cornea; an illuminating optical system illuminating an anterior segment on which a reference mark is placed; an imaging optical system capturing an anterior segment image containing the reference mark and an image of the index reflected from the cornea; an image processor overlaying an astigmatic axis mark indicating a direction of an astigmatic axis of the cornea, which is calculated based on the index image, on the anterior segment image; and a controller displaying the anterior segment image, which contains the astigmatic axis mark, on a display.

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 relates to an in vivo corneal parameter measuring device and measuring method based on optical coherence tomography comprises an anterior segment optical coherence tomography system, anair-mediated ultrasonic emission system, a switchable non-contact intraocular pressure measuring correction system, an infrared transmissive glass plate, a processor, and a display. The corneal three-dimensional morphology images were obtained by the anterior segment optical coherence tomography system. When the ultrasound generated by the air-mediated ultrasound emission system caused the cornealresonance, the whole corneal elastic modulus was obtained from the corneal optical coherence tomography images loaded with the resonance ultrasound signal. At the same time, accord to the three-dimensional shape image of the cornea and the total corneal elastic modulus value, a switchable non-contact IOP measurement correction system is utilized to effectively correct the IOP value measure routinely to obtain an accurate IOP value, so as to overcome the inaccuracy of constant quantification processing of the corneal shape and biomechanical properties when the IOP is measured by the prior art.

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.

An ophthalmic apparatus capable of obtaining characteristics of a cornea which are suitable for calculating power of an intraocular lens to be injected into an examinee's eye which has undergone refractive surgery comprises an input unit which inputs data on a shape of the cornea after refractive surgery, and a calculation unit having a program which calculates post-operative corneal refractive power based on the post-operative corneal shape, wherein the program determines a non-corrected region based on the post-operative corneal shape, estimates a pre-operative corneal shape in a corrected region by calculating an approximate curve from a corneal shape in the non-corrected region, calculates pre-operative corneal refractive power based on the pre-operative corneal shape, calculates correction refractive power in the refractive surgery based on the post-operative corneal shape and the pre-operative corneal shape, and calculates post-operative corneal refractive power based on the pre-operative corneal refractive power and the correction refractive power.

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.

The invention relates to a handheld acquisition system for recording cornea information. The handheld acquisition system comprises a projection part (101), a camera lens (103), a camera (104) and an image analysis system (105), wherein the projection part (101) consists of LED backlight sources (111) and a Placido disk; the inner surface of the Placido disk adopts concentric circular rings which are uniformly chequered with black and white; and light rays emitted by the LED backlight sources (111) are blocked by black parts in the rings and penetrate through the white part in the rings to be transmitted to a cornea (112) to be tested, the inner part of the Placido disk adopts a rotational symmetry discretionary face type, the opening part facing the cornea (112) to be tested, of the Placido disk is extended as far as possible to be convenient for processing of the inner part of the Placido disk, and the rays reflected from the cornea (112) to be tested are imaged through the camera lens (104). The acquisition system is adopted, so that good view fields and image quality can be obtained, and shape changing rule of the shape of the cornea can be conveniently obtained.

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.

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.

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 election unit to blow air pressurized by driving the piston toward a cornea of an eye to be inspected, and an interocular pressure measuring unit to detect a deformed state of the cornea and measure an interocular 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.

The invention discloses a corneal shaping device for correcting myopia, the device comprises a fixing part and a shaping part, the fixing part is permeable to oxygen and a cross-linking agent, the shaping part comprises a material permeable to ultraviolet light, and the bottom of the shaping part forms a curved surface complementary to the desired shape of the cornea. The invention also discloses the use of the corneal shaping device for correcting myopia, wherein an ultraviolet irradiation device is used for irradiating the cornea through the shaping part.