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37 results about "Cornea thickness" patented technology
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Normal corneal thickness is about 540 microns (half of a millimeter). Thickness is checked with a handheld ultrasound device called a pachymeter.
Combination advanced corneal topography/wave front aberration measurement
A method for the simultaneous measurement of the anterior and posterior corneal surfaces, corneal thickness, and optical aberrations of the eye. The method employs direct measurements and ray tracing to provide a wide range of measurements for use by the ophthalmic community.
Owner:LASERSIGHT TECH
Combination advanced corneal topography/wave front aberration measurement
InactiveUS20010033362A1Immobilised enzymesBioreactor/fermenter combinationsAberrations of the eyeCorneal surface
Owner:LASERSIGHT TECH
Device and method to measure corneal biomechanical properties and its application to intraocular pressure measurement
This invention is a system, an apparatus and a method for measuring biomechanical properties of cornea and the intraocular pressure in vivo. More than one dimensional topographic information of the cornea is recorded and analyzed before and during the fluid discharge and converted to the stress-strain relationship and other cornea parameters, for example the cornea thickness and radius of curvature, etc. The deformation of cornea is initiated by a non-contact fluid discharge whose profile is predetermined and monitored in real time. Utilizing this non-contact topographer, the true intraocular pressure can be derived from the response of the cornea due to the impact of fluid discharge and the corneal topographic parameters. One embodiment of this invention includes the use of a multiple color strobe light / multiple detector system to record the corneal topographic deformation due to the impact of fluid discharge.
Owner:JIM SON CHOU ACHEVE TECH
Combination advanced corneal topography/wave front aberration measurement
A method and apparatus for the simultaneous measurement of the anterior and posterior corneal surfaces, corneal thickness, and optical aberrations of the eye. The method employs direct measurements and ray tracing to provide a wide range of measurements for use by the ophthalmic community.
Owner:LASERSIGHT TECH
Combination advanced corneal to topography/wave front aberration measurement
InactiveUS6428168B2Immobilised enzymesBioreactor/fermenter combinationsCorneal surfaceAberrations of the eye
A method and apparatus for the simultaneous measurement of the anterior and posterior corneal surfaces, corneal thickness, and optical aberrations of the eye. The method employs direct measurements and ray tracing to provide a wide range of measurements for use by the ophthalmic community.
Owner:LASERSIGHT TECH
Non-contacting tonometer
ActiveUS7201720B2Decreasing level of trainingImprove comfortTonometersGeometric propertyNon contact tonometer
Apparatus and method for measuring Internal Ocular Pressure (IOP) comprises applying a perturbing vibration into an eye over a range of frequencies. A vibrational response of the surface of the eye is measured such as by using a laser velocimeter, the vibrational response including velocity and rate of change of the phase lag. Further, geometric properties such as volume of the eye are measured such as by using a laser interferometer to measure characteristics such as the eye's axial length and cornea thickness. Use of multiple characteristics normalizes the effect of an eye's mechanical and geometric properties and thereby more accurately determines the IOP.
Owner:ISONIC MEDICAL
Apparatus for corneal shape analysis and method for determining a corneal thickness
ActiveUS20150190046A1Easy constructionAccurate measurementMedical imagingGonioscopesAnterior surfaceCorneal 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.
Owner:CASSINI TECH BV
System and method for evaluating a secondary LASIK treatment
InactiveUS20040116910A1Laser surgerySurgical instrument detailsBiomedical engineeringCornea thickness
A method and system are disclosed for evaluating the safety of a prospective secondary LASIK treatment to correct a person's vision. The difficulties with making an accurate, direct measurement of corneal thickness of a cornea having a pre-existing keratectomy are overcome by using pre-LASIK topography and pachymetry measurements, and per- and post-LASIK wavefront measurements to determine post-LASIK corneal thickness, and thus the suitability and safety of a prospective secondary LASIK procedure. A system embodiment includes diagnostic and computing platforms for generating and analyzing data, and a device readable medium for storing and transferring an instruction to a laser ablation system.
Owner:TECHNOLAS PERFECT VISION
Cornea measuring method and system
The invention discloses a cornea measuring method and a cornea measuring system. The cornea measuring method comprises the following steps: carrying out measurement by adopting an optical coherence tomography method, thus obtaining the optical path L0 from the front surface to the rear surface of the cornea; moving a focusing lens, wherein when the focal point of detection light is located on thefront and rear surfaces of the cornea, the signal intensity is the maximal value, and acquiring the distance L1 between the two corresponding positions where the focusing lens is located when the focal point of detection light is located on the front and rear surfaces of the cornea; acquiring the refractive index of the cornea and the thickness of the cornea by utilizing the ray tracing technology. With the method and the system, the non-contact in-vivo accurate measurement for the refractive index of the cornea and the thickness of the cornea is realized and can serve as the reference for therefractive surgery of the human eyes, a reliable basis is provided for calculating the eye parameters, and thus the ideal refraction effect is achieved for the human eyes after the surgery.
Owner:东北大学秦皇岛分校
Eye multi-interface distance measuring method and eye multi-interface distance measuring device
The invention discloses an eye multi-interface distance measuring method and an eye multi-interface distance measuring device. The method comprises the following steps of dividing short-coherence light into two channels; recording interference spectrum information of front and rear surfaces of a cornea, front and rear surfaces of a crystalline lens and a surface of a retina; and performing FFT (fast fourier transform) on the interference spectrum information to obtain opposite positions L5, L4, L3, L2 and L1 of the front surface of the cornea of an eye, the rear surface of the cornea, the front surface of the crystalline lens, the rear surface of the crystalline lens and the surface of the retina. One channel of short-coherence light serving as probe light enters a fast zooming system 1, three optical paths are switched over by the fast zooming system 1 and respectively measure the front and rear surfaces of the cornea of the eye, the front and rear surfaces of the crystalline lens and the surface of the retina, the other channel of short-coherence light serving as reference light enters a multi-optical-path reference system 2 to perform corresponding reference light optical path compensation, and the front and rear surfaces of the cornea, the front and rear surfaces of the crystalline lens and the surface of the retina can be detected continuously. By the eye multi-interface distance measuring method and the eye multi-interface distance measuring device, accurate cornea thickness, anterior chamber depth, crystalline lens thickness and visual axis length are obtained.
Owner:NORTHEASTERN UNIV
Apparatus for corneal shape analysis and method for determining a corneal thickness
ActiveUS9743832B2Easy constructionAccurate measurementEye diagnosticsSurgical field illuminationAnterior surfaceCorneal shape
Owner:CASSINI TECH BV
Improved apparatus and method of intraocular pressure determination
An improved apparatus and method of intraocular pressure determination is disclosed in which applanation tonometery is done simultaneously with pachymetry. The method allows for increased accuracy of intraocular pressure determination based upon adjustments of applanation tonometry for corneal thickness. The device allows an untrained operator to quickly and easily determine the accurate intraocular pressure.
Owner:EMOTION PACIFICA
A non-contacting tonometer
The invention relates to apparatus and method for measuring Internal Ocular Pressure (IOP) comprises applying a perturbing vibration (2) into an eye (1) over a range of frequencies. A vibrational response of the surface of the eye is measured such as by using a laser velocimeter (6), said response including velocity and rate of change of the phase lag. Further, geometric properties such as volume of the eye are measured such as by using as a laser interferometer (13) to measure characteristics such as the eye's axial length and cornea thickness. Use of multiple characteristics normalize the effect of an eye's mechanical and geometric properties and thereby more accurately determine the IOP.
Owner:ERIC TECH CORP
System and method for corneal pachymetry using plenoptic imaging
Embodiments described herein provide improved systems and methods for corneal pachymetry. These systems and methods can be used to improve the accuracy of corneal measurements that are used for a wide variety of different ophthalmic procedures. One embodiment provides a system and method for corneal pachymetry using a plenoptic detector. For example, a corneal pachymetry system can comprise a light source, a plenoptic detector and a processing system coupled to the plenoptic detector. The light source is configured to illuminate the cornea of the eye, and the plenoptic detector is positioned at an angle relative to the eye. The plenoptic detector is configured to receive an image of the light source reflected from the cornea and generate plenoptic image data representing the images. The processing system is coupled to the plenoptic detector and is configured to analyze the plenoptic image data to accurately determine the corneal thickness of the eye.
Owner:AMO DEVMENT
Diopter calculation method of toric intraocular lens (Toric IOL)
The invention discloses a diopter calculation method for a toric intraocular lens. The method comprises the following steps of: calculating the change of the tangential curvature of the front surfaceof a cornea through SIA provided by a doctor after a corneal incision is made, and obtaining the tangential curvatures of a flat axis and a steep axis of the front surface of the cornea; calculating curvature radiuses of flat axis and the steep axis of the front surface of the cornea according to the tangential curvature of the flat axis and the steep axis of the front surface of the cornea, and calculating curvature radiuses of the flat axis and the steep axis of the rear surface of the cornea according to the tangential curvatures of the flat axis and the steep axis of the rear surface of the cornea; further calculating the focal length of the incident light and the output light on the anterior surface of the flat and steep axes, the focal length of the incident light and the output light on the posterior surface and the focal length of the incident light on the intraocular lens according to the radius of curvature, corneal thickness, anterior chamber depth, ocular axis length, intraocular lens parameters and reserved diopter of the anterior and posterior surfaces of the flat and steep axes, and then calculating the diopter of the required IOL flat axis and steep axis.
Owner:杭州明视康眼科医院有限公司
Method for preparing pig corneal endothelium implant piece by adopting femtosecond laser technology for assistance
ActiveCN109363801AGood biocompatibilityReduce the difficulty of transplantationEye implantsLaser technologyCorneal surface
The invention discloses a method for preparing a pig corneal endothelium implant piece by adopting a femtosecond laser technology for assistance. The method comprises the following steps that S1, a pig cornea is pretreated; S2, after the pig cornea enters an interactive interface of a femtosecond laser machine, surgical parameters of femtosecond lasers are set according to a pig cornea thickness value measured before surgery, the lasers are precisely gathered on a set corneal surface and flattened, and laser blasting and gasified cutting are conducted to complete manufacturing of a corneal posterior lamellum implant piece which is a corneal endothelium piece with a posterior elastic layer, wherein the thickness is 100 microns, and the diameter is 8.5 mm; S3, decellularization operation isconducted through physical methods such as swelling, repeated freezing and thawing, shaking and air drying; S4, the pig corneal endothelium implant piece is prepared. The method adopts an instantaneous laser blasting technology so that precise corneal cutting can be completed, the immunogenicity of a pig corneal matrix piece is reduced, and the ultra-thin pig corneal endothelium implant piece withthe posterior elastic layer can also be prepared at the same time, so that transplantation difficulties caused by nonuniform thickness are greatly reduced.
Owner:黄国富 +1
Cornea surface optical path difference measuring device and method of measuring cornea thickness and refractivity
PendingCN109691972AAccurate thickness measurementHigh precisionEye diagnosticsKeratorefractive surgeryHigh resolution imaging
A time domain-optical coherence tomography (TD-OCT) technology is adopted to carry out high resolution imaging on a human cornea; the thickness of the human cornea can be accurately measured by usinga quick zoom lens; through the moving distance of a reference arm, the optical path difference between the front surface and the rear surface of a cornea can be calculated, thus the refractivity of the cornea can be calculated by ZEMAX optical simulation software; and the method is noncontact and is used to measure the thickness and refractivity of a cornea. The method can measure the thickness and refractivity of a cornea in a human body, the measurement is noncontact, high precision, and nondestructive; moreover, after a corneal surgery, the thickness and refractivity of corneas can be tracked, and at the same time, a preoperative detection device and method are provided for a refractive surgery.
Owner:FOSHAN UNIVERSITY
Corneal thickness measuring method based on subdivision of pulses
ActiveCN102599939BHigh center frequencyAchieve Ultrasonic Thickness MeasurementEye diagnosticsEye inspectionAnterior corneaEngineering
The invention provides a corneal thickness measuring method based on subdivision of pulses, which belongs to an ultrasonic thickness measuring method. Measurement precision of the corneal thickness measuring method can achieve the micrometer level. Subdivision of pulse is realized by the aid of phase shift of a transmitted pulse, an ultrasonic signal which is reflected back is received, the frontwall and the rear wall of a cornea are judged, a single measurement result is calculated, a next transmitted pulse shifts by a subdivided phase of a pi phase, an ultrasonic signal which is reflected back is received, a current measurement result is obtained, and after total transmitted pulses shift by the pi phase, a last measurement result is obtained. Accurate distances from two sides of the cornea to an ultrasonic sensor are calculated according to the phases corresponding to the maximum values of all the subdivision results, and the final cornea thickness value is obtained by means of subtracting the two accurate distances. If subdivided steps are N, measurement precision is 1 / N of semi-wavelength. The corneal thickness measuring method has the advantages that the ultrasonic thicknessmeasuring method is realized by the aid of subdivision of pulses, the measurement precision can achieve the micrometer level. Resolution ratio of the method is high, center frequency of a probe does not need to be too high, and the corneal thickness measuring method is easy to be popularized.
Owner:XUZHOU KAIXIN ELECTRONICS INSTR
Combined applanation tonometer and ultrasonic pachymeter
InactiveUS7452330B2Convenient, quick and accurate determinationAccurately reflectTonometersCorneal surfaceApplanation tonometer
An improved apparatus and method of intraocular pressure determination is disclosed in which applanation tonometry is done with an ultrasonic transducer. The method allows for increased accuracy of intraocular pressure determination based upon adjustment of applanation tonometry for subjacent corneal thickness. The device allows for the operator to view the corneal surface and the pattern of dye to determine the precise endpoint of applanation.
Owner:SUBLASE
Eye aberration individualized cutting type rectification method
InactiveCN1541633AImprove eyesightLaser surgeryEye diagnosticsKeratorefractive surgeryWave aberration
The present invention is cutting type human eye aberration personally correcting method. Human eye wave aberration value the human eye aberration instrument measures is converted into cornea thickness cutting amount for refraction operation apparatus to perform personal eye cutting operation to correct human eye aberration. The corrected aberration includes not only myopia, hyperopia, astigmatism and other lower aberration components but also coma aberration, spherical aberration and other higher aberration components. The method can improve human eye's optical characteristic at most and improve eyesight.
Owner:贺极苍 +1
An intelligent screening system suitable for high myopia complicated by open-angle glaucoma and its establishment method
ActiveCN109528155BFast and Accurate ScreeningAvoid damageMedical data miningMedical automated diagnosisIntra ocular pressureOpen angle glaucoma
The invention relates to an intelligent screening system suitable for high myopia complicated by open-angle glaucoma and its establishment method. Based on the repeated testing, adjustment and training of a large number of clinical data of patients with high myopia, the system learns to identify and evaluate optic disc morphology, retinal nerve fiber layer thickness in each quadrant, macular ganglion cell complex thickness from glaucoma OCT examination, and evaluate visual field in visual field examination. For the degree of defect, the degree of optic disc tilt, rotation and β-zone atrophy can be identified and evaluated in fundus images, and then the basic information of the patient, intraocular pressure, spherical power, corneal thickness, eye axis and other indicators can be combined to form a comprehensive screening result. Clinicians provide relevant clinical data to the system of the present invention, and the system of the present invention can quickly and accurately screen out patients with high myopia complicated by open-angle glaucoma or give a risk assessment, providing doctors with early detection and early prevention of high myopia complicated by open-angle glaucoma Glaucoma provides evidence.
Owner:EYE & ENT HOSPITAL SHANGHAI MEDICAL SCHOOL FUDAN UNIV
Device for evaluating corneal removal amount in refractive operation through optical coherence elastography
PendingCN113576396AConvenient corneal thickness detectionThe test result is accurateOthalmoscopesFixed frameRefractive surgery
The invention relates to a corneal removal amount device, in particular to a device for evaluating the corneal removal amount in a refractive operation through optical coherence elastography. The technical problem of the invention is to provide the device for evaluating the corneal removal amount in the refractive operation through optical coherence elastography, which can fix the position of a lens and can prevent the cornea of a patient from being hurt by too strong light. The device for evaluating the corneal removal amount in the refractive operation through optical coherence elastography comprises a first supporting framearranged on one side of a fixing frame and the fixing frame, a concave mirror frame arranged on the first support frame in a sliding manner, and a convex mirror frame arranged on the first support frame in a sliding manner and arranged on one side of the concave mirror frame. Through cooperation of the concave mirror frame, the convex mirror frame, a shading mechanism and a buffer mechanism, the medical staff can detect the cornea thickness of a patient more conveniently, external light can be shielded, and the detection result is more accurate.
Owner:中山大学中山眼科中心南昌眼科医院
Corneal thickness measuring method based on subdivision of pulses
ActiveCN102599939AHigh center frequencyAchieve Ultrasonic Thickness MeasurementEye diagnosticsEye inspectionAnterior corneaEngineering
The invention provides a corneal thickness measuring method based on subdivision of pulses, which belongs to an ultrasonic thickness measuring method. Measurement precision of the corneal thickness measuring method can achieve the micrometer level. Subdivision of pulse is realized by the aid of phase shift of a transmitted pulse, an ultrasonic signal which is reflected back is received, the frontwall and the rear wall of a cornea are judged, a single measurement result is calculated, a next transmitted pulse shifts by a subdivided phase of a pi phase, an ultrasonic signal which is reflected back is received, a current measurement result is obtained, and after total transmitted pulses shift by the pi phase, a last measurement result is obtained. Accurate distances from two sides of the cornea to an ultrasonic sensor are calculated according to the phases corresponding to the maximum values of all the subdivision results, and the final cornea thickness value is obtained by means of subtracting the two accurate distances. If subdivided steps are N, measurement precision is 1 / N of semi-wavelength. The corneal thickness measuring method has the advantages that the ultrasonic thicknessmeasuring method is realized by the aid of subdivision of pulses, the measurement precision can achieve the micrometer level. Resolution ratio of the method is high, center frequency of a probe does not need to be too high, and the corneal thickness measuring method is easy to be popularized.
Owner:XUZHOU KAIXIN ELECTRONICS INSTR
Non-biological artificial cornea and installation method
The invention discloses a non-biological type artificial cornea and an installation method, belongs to the technical field of artificial corneas, and aims to solve the problems that an existing artificial cornea is insufficient in sealing and difficult to flexibly adjust. The artificial cornea comprises an optical lens column and an umbrella-shaped wing, the optical lens column is arranged in an opening in the center of the umbrella-shaped wing, and the special-shaped fixing ring is movably arranged on the optical lens column; threads are arranged on the outer side wall of the optical lens column, a threaded hole matched with the threads of the optical lens column is formed in the middle of the special-shaped fixing ring, an extension part extending to the upper surface of the umbrella-shaped wing is arranged on the periphery of the upper surface of the optical lens column, and the extension part is attached to the upper surface of the umbrella-shaped wing. The beneficial effects are that through cooperation of the optical lens column and the special-shaped fixing ring, flexible adjustment can be carried out according to cornea thicknesses of different patients so as to achieve a good sealing state, bacteria are prevented from entering and fluid loss is prevented, and the success rate of transplantation operation is increased; and the concave part on the optical lens column is matched with the parallel edge of the special-shaped fixing ring and a surgical instrument, so that surgical operation can be effectively facilitated.
Owner:姚晓明
Device, method and control program for ophthalmologic, particularly refractive, laser surgery
The present invention discloses a device for use in ophthalmology, in particular for refractive laser surgery, which aligns a desired ablation profile with predetermined corneal points and takes into account the depth of the anterior chamber of the eye, measured individually for each patient (including corneal thickness) The predetermined corneal point is calculated from the image data of the eye tracker.
Owner:ALCON INC
Ophthalmologic apparatus and ophthalmologic system
Provided is an ophthalmologic apparatus capable of measuring a cornea thickness with good accuracy over a wide range of cornea thickness distribution. The ophthalmologic apparatus is capable of measuring the cornea thickness of an eye to be inspected based on a width of an image of scattered light on a light receiving element for receiving light scattered in a cornea of the eye to be inspected, of slit light projected to the cornea, and an intensity of light received by the light receiving element.
Owner:CANON KK
A Calculation Method of Diopter of Intraocular Lens
ActiveCN109683311BImprove calculation accuracyIntraocular lensOptical elementsCorneal surfaceAnterior cornea
Owner:HANGZHOU MSK EYE HOSPITAL CO LTD
A method and device for measuring distance between multiple interfaces of eyes
ActiveCN105147238BAccurate thicknessDoes not affect position measurementGonioscopesFast Fourier transformRetina
The invention discloses a method and device for measuring the multi-interface distance of the eye. The method includes: dividing short coherent light into two paths, one path entering the fast zoom system 1 as detection light, and the fast zoom system 1 switches three light paths to measure the eyes respectively. The front and back surfaces of the cornea, the front and back surfaces of the lens and the retinal surface are used as reference light to enter the multi-optical path reference system 2 to perform corresponding reference light optical path compensation to achieve continuous control of the front and back surfaces of the cornea, the front and back surfaces of the lens and the retinal surface. Detection: record the interference spectrum information of the front and back surfaces of the cornea, the front and back surfaces of the lens and the surface of the retina, and perform FFT transformation on the spectral information to obtain the front surface of the cornea, the back surface of the cornea, the front surface of the lens, and the back surface of the lens. and the relative positions L5, L4, L3, L2, and L1 between the retinal surface. The present invention achieves accurate corneal thickness, anterior chamber depth, lens thickness, and visual axis length.
Owner:NORTHEASTERN UNIV LIAONING
Apparatus for corneal shape analysis and method for determining a corneal thickness
Owner:STICHTING VUMC +1
Cross-linking protective agent of cornea, and preparation method and application of cross-linking protective agent of cornea
InactiveCN111166935AImprove mechanical propertiesHigh modulus of elasticityEye implantsTissue regenerationOphthalmologyBovine serum albumin
The invention provides a cross-linking protective agent of a cornea, and a preparation method and application of the cross-linking protective agent of a cornea, and relates to the technical field of cross-linking protective agents. The cross-linking protective agent is prepared through adding a protective agent namely bovine serum albumin (BSA) to a natural cross-linking agent solution. The cross-linking protective agent disclosed by the invention can effectively increase the transparency of a cross-linking cornea, can protect cornea thickness changes and can effectively improve mechanical properties of the cornea.
Owner:SHANDONG EYE INST
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