| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 351212000 | For cornea curvature measurement | 39 |
| 20080204659 | Placido Projector for Corneal Topography System - A placido projector for a corneal topography system includes a substrate having dielectric phosphor. The substrate is configured to be activated by electric current and responsive to emit light. A plurality of opaque, concentric rings are formed on the substrate. When the substrate emits light responsive to the electric current, a placido image is projected. The concentric rings can be formed using silk screening or other techniques. The dielectric phosphor can be micro-encapsulated and deposited onto the substrate. The substrate may be an electro-luminance panel. A protective cover is placed adjacent to the substrate to retain the substrate in a predetermined shape. In one embodiment, the placido projector has a frusto conical shape. | 08-28-2008 |
| 20080212030 | Corneal measurement apparatus and a method of using the same - An apparatus for measuring a subject's cornea, comprising (A.) a slit projection subsystem comprising a light source, (B.) a mask subsystem disposed in a path of light from the light source, comprising a first slit mask defining a plurality of apertures, (C.) a movement apparatus adapted to move at least a portion of the slit projection subsystem, the movement apparatus configured and arranged such that, by moving the portion of the slit projection subsystem, portions of the light can be selectively transmitted through an aperture of the plurality of apertures toward the cornea, (D.) an imaging element configured and arranged to image at least one of the plurality of apertures onto the cornea, and (E.) an image capture subsystem arranged to capture images of the portions of light after the light impinges on the cornea. | 09-04-2008 |
| 20080231806 | OPHTHALMIC APPARATUS - An ophthalmic apparatus comprises a projection system in which a pattern member is provided with a predetermined pattern for measuring the shape of the cornea of an eye of a subject, the predetermined pattern is thereby projected on the cornea of the eye of the subject, and an optical observation system in which light flux having a shape of the predetermined pattern emitted from the projection system is reflected at the cornea of the eye of the subject, the eye of the subject is observed by the light reflected by the cornea. A surface at the eye of the subject side of the pattern member is coated with a paint having a filtering property that transmits infrared light and blocks visible light. | 09-25-2008 |
| 20080259276 | Method and Apparatus For Measuring the Deformation Characteristics of an Object - Embodiments of the invention are generally directed to apparatus and methods for measuring a deformation characteristic of a deformable target surface. The measurement principles of the invention may be applied to a large variety of organic (e.g., human, animal or plant tissue) and inorganic materials having a surface that can be deformed by an applied non-contact force. The surface may be light diffusing and non-transparent or non-diffusing and transparent. An illustrative embodiment of the invention is directed to a device for measuring a deformation characteristic of a cornea. The device comprises a corneal topographer and a non-contact tonometer that is operationally integrated with the corneal topographer. In an aspect, the corneal topographer is a rasterstereography-based topographer. Use of the inventive device enables a method for measuring a deformation characteristic of the cornea. In addition to the measurable deformation characteristics listed above, dioptric power, intraocular pressure, corneal hysteresis, corneal elasticity, corneal viscosity and various known corneal topography characteristics can be measured. | 10-23-2008 |
| 20080297724 | Ophthalmic apparatus and a method to determine power of an intraocular lens - 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. | 12-04-2008 |
| 20090002631 | SYSTEM AND METHOD FOR MEASURING CORNEAL TOPOGRAPHY - A system measures a corneal topography of an eye. The system includes a group of first light sources arranged around a central axis, the group being separated from the axis by a radial distance defining an aperture in the group; a plurality of second light sources; a detector array; and an optical system adapted to provide light from the second light sources through the aperture to a cornea of an eye, and to provide images of the first light sources and images of the second light sources from the cornea, through the aperture, to the detector array. The optical system includes an optical element having a focal length, f. The second light sources are disposed to be in an optical path approximately one focal length, f, away from the optical element. | 01-01-2009 |
| 20090046250 | MULTI-PURPOSE OPHTALMOLOGICAL APPARATUS - The present invention relates to a multi-purpose opthalmological apparatus, comprising first optical means, provided with one or more first mires, and sensing means for acquiring along a first optical path an image comprising said one or more first mires reflected by a patient's eye, characterised in that it comprises separating optical means for separating the first optical path from at least one second optical path, and in that it further comprises second optical means, provided with one or more second mires, located along the first optical path between the separating optical means and the sensing means, whereby said image further comprises said one or more second mires reflected by the patient's eye. | 02-19-2009 |
| 20090135372 | Modular ocular measurement system - A modular ocular measurement system combines reflection corneal topography with dynamic pupil, limbus, and contact lens measurement, projection corneal-scleral topography, and ocular wavefront measurement to meet the general needs of routine clinical practice, thereby increasing the general commercial viability, as well as the unmet needs of correcting the highly aberrated eye, and in particular the design of wavefront-guided corrections (e.g., soft lenses for the highly aberrated eye, refractive surgery, IOLs, inlays, onlays, etc.). | 05-28-2009 |
| 20090153801 | Light Projection Target Mire For Curvature Measurements - The present invention refers to the light ring target mire ( | 06-18-2009 |
| 20090185134 | Monochromatic multi-resolution corneal topography target - A method to encode both high-resolution and low-resolution reflected features of a cornea to improve the measurements for reflection based corneal topography systems. The corneal topography reflective target provides for multiple resolutions of measurements to be obtained from a single acquisition. | 07-23-2009 |
| 20100079726 | Placido projector for corneal topography system - A placido projector for a corneal topography system includes a substrate having dielectric phosphor. The substrate is configured to be activated by electric current and responsive to emit light. A plurality of opaque, concentric rings are formed on the substrate. When the substrate emits light responsive to the electric current, a placido image is projected. The concentric rings can be formed using silk screening or other techniques. The dielectric phosphor can be micro-encapsulated and deposited onto the substrate. The substrate may be an electro-luminance panel. A protective cover is placed adjacent to the substrate to retain the substrate in a predetermined shape. In one embodiment, the placido projector has a frusto conical shape. | 04-01-2010 |
| 20100123873 | METHOD OF QUALIFYING LIGHT SPOTS FOR OPTICAL MEASUREMENTS AND MEASUREMENT INSTRUMENT EMPLOYING METHOD OF QUALIFYING LIGHT SPOTS - A method of determining a wavefront of a received light beam includes: (a) receiving a light beam; (b) producing a group of light spots from the light beam; (c) qualifying a set of the light spots for use in determining a wavefront of the received light beam; and (d) determining the wavefront of the received light beam using the qualified set of light spots. Qualifying the set of light spots includes, for each light spot: calculating a first calculated location of the light spot using a first calculation algorithm; calculating a second calculated location of the light spot using a second calculation algorithm; and when a difference between the first and second calculated locations for the light spot is greater than an agreement threshold, excluding the light spot from the set of light spots and/or from being employed in determining the wavefront of the received light beam. | 05-20-2010 |
| 20100182568 | Continuous two-dimensional corneal topography target - A two-dimensional reflection pattern suitable for corneal topography that uses sinusoidal profiles of both intensity and color values. The technique provides a more robust image processing due to the ability to apply digital band pass filters, continuous data for improved surface reconstruction, and the ability to directly measure the meridian of the reflection pattern source point when the corneal surface normal does not lie in the meridian of the measurement instrument. | 07-22-2010 |
| 20100231858 | ADAPTIVE SEQUENTIAL WAVEFRONT SENSOR WITH PROGRAMMED CONTROL - One embodiment is a machine comprising a sequential wavefront scanner, a variable aperture, a position sensing device and an electronic control and detection system. The electronic control and detection system is configured to control the sequential wavefront scanner to shift the incident wavefront by a set of displacements selected to form a selected scanning pattern to scan the incident wavefront and configured to vary the aperture size to vary detection resolution at different parts of the scanning pattern. | 09-16-2010 |
| 20100238408 | METHOD AND APPARATUS FOR DETERMINING DYNAMIC DEFORMATION CHARACTERISTICS OF AN OBJECT - Apparatus and methods for measuring a dynamic deformation characteristic of a deformable target surface during a deformation interval. The measurement principles may be applied to a large variety of organic and inorganic materials having a surface that can be deformed by an applied non-contact force. The surface may be light diffusing and non-transparent or non-diffusing and transparent. A device for measuring a dynamic deformation characteristic of an in-vivo cornea during a deformation interval includes a corneal topographer and an air puff generator that are operationally integrated. Use of the inventive device enables a method for making a measurement of a deformation characteristic of the in-vivo cornea during a deformation interval, further allowing a determination of spatially-resolved in-vivo corneal biomechanical and biodynamic properties such as corneal elasticity and corneal viscosity. | 09-23-2010 |
| 20100302509 | METHOD OF DETERMINING A CONTACT LENS - The invention relates to a method of determining and selecting a contact lens with an opthalmological device for examining the eyes, the opthalmological device comprising a keratometer and an autorefractometer as well as a data processor, whereby a refractive power of an eye and a topography of a cornea are determined, whereby refraction data describing a refraction of an eye to be examined are obtained, whereby topographic data describing the topography of the cornea of the eye are obtained, and whereby, by using the obtained refraction and topography data, contact lens data are calculated and a contact lens is selected from a database of the opthalmological device. In accordance with an apparatus embodiment of the invention, an opthalmological device for carrying out the method is also described. | 12-02-2010 |
| 20110025979 | CUSTOM CONTACT LENSES WITH FIDUCIAL MARKINGS - A contact lens having one or more fiducial marks that allow the measurement of lens rotation and centration. The lens may be a trial lens. The lenses can be used to apply correction factors for sphero-cylindrical refractive error, higher order aberrations, and corneal topography. | 02-03-2011 |
| 20110075098 | CORNEA SHAPE MEASUREMENT APPARATUS - 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. | 03-31-2011 |
| 20110090459 | DEVICE AND METHOD FOR MEASURING A CORNEA - In order to measure a cornea with the aid of a projection (S | 04-21-2011 |
| 20110273669 | MULTIFUNCTIONAL OPTHALMIC MEASUREMENT SYSTEM - A wavefront measurement system, for measurement of aberrations in the eye, and for measurement of the topography of the cornea of the eye. The system differs from previously available systems in that the wavefront measurement of the eye's aberrations can be performed as a function of eye accommodation. Furthermore, methods for reducing corneal reflection are described. Additionally, the use of a very short focal length Hartman Shack lenslet array enables a very wide range of low order aberrations, up to ±25 diopters, to be measured without any refocusing or motion of the system. Also, methods are described for enabling the presence of defects within the eye to be determined using the aberration measurement system. Another embodiment captures the pupil centering position without any projected illumination pattern being used, so that a subsequent accurate centering and focusing procedure can commence at the initially captured position, thus reducing measurement time. | 11-10-2011 |
| 20120113391 | Systems and Methods for Measuring Surface Shape - A system for determining a surface shape of a test object includes a pattern having a plurality of first elements dispose about a central axis and defining an aperture containing the central axis. The first elements includes a plurality of common elements having a common form and a reference element having a reference form that is different than the common form. The system further comprises a detector array and an optical system. The optical system is adapted to provide an image of the first elements when light reflects off a surface of a test object, passes through the aperture, and is received by the detector array. The reference form may be configured to facilitate an association between the common elements and the spot images of the common elements. | 05-10-2012 |
| 20120229767 | ASSESSMENT OF TOPOGRAPHIC SEMI-MERIDIAN PARAMETERS FOR CORNEAL ASTIGMATISM ANALYSIS AND VECTOR PLANNING TREATMENT - Techniques are disclosed in which a topographic parameter is determined in each hemidivision of the eye by considering the topography of reflected images from a multiplicity of illuminated concentric rings of the cornea. A simulated spherocylinder is produced to fit into each ring and conform to the topography thereof from which a topographic parameter for each ring can be obtained. All of the topographic parameters of each ring are combined and a mean summated value is obtained representing magnitude and meridian of each hemidivision. From these parameters, a single topographic value for the entire eye (CorT) can be found as well as a value representing topographic disparity (TD) between the two hemidivisions. The topography values for the hemidivisions are used in a vector planning system to obtain treatment parameters in a single step operation. | 09-13-2012 |
| 20130050650 | Ophthalmological Analysis Instrument And Method - An ophthalmological analysis instrument includes a first analysis apparatus for measuring a curvature of a cornea of an eye, such as a keratometer or the like, and a second analysis apparatus. The second analysis apparatus includes a projection device and a monitoring device. The projection device includes at least one slit projection unit for projecting a light slit onto a surface of the eye. An image of the light slit is recordable by the monitoring device, the light slit being projectable onto a region of a limbus of the eye by the slit projection unit. A topography of the surface in the region of the limbus is derived from the image of the light slit imaged on the surface. | 02-28-2013 |
| 20130100408 | Calculating an intraocular lens (IOL) power according to a directly determined IOL location - In certain embodiments, calculating intraocular lens (IOL) power includes determining locations of parts of an eye along an axis of the eye. The locations include the location of a cornea, the anterior and posterior locations of a crystalline lens, and the location of a retina. An IOL location of an IOL is calculated according to the anterior and posterior locations of the crystalline lens. Corneal data is also determined. The IOL power is calculated using the corneal data, the IOL location, and the retinal location. In certain embodiments, refractive indices are determined for segments of the axis, and at least one location is adjusted according to the refractive indices. | 04-25-2013 |
| 20130201451 | Corneal Topographer - This invention describes a corneal topographer with a light source to project a pattern light on the cornea, imaging optics for collecting the reflection from the cornea and projecting it on to a photo-sensor, an optical mask to modulate the light beam such that focusing error of the corneal image results in displacement of its spatial spectrum relative to a reference spectrum. Defocus maps, depth-maps and a corneal topogram can be constructed by measuring and processing the spectral displacement corresponding different sub-regions of the cornea. The cornea topographer is compact and inexpensive. The corneal topograph can be used in refractive eye surgery and in contact lens fitting. | 08-08-2013 |
| 20130286351 | CORNEA SHAPE MEASUREMENT APPARATUS - A cornea shape measurement apparatus includes: a first projecting optical system configured to project a first target on the cornea; a first imaging optical system configured to capture a reflection image of the first target projected on the cornea; a second projecting optical system configured to project a second target different from the first target on the cornea to measure a corneal shape; a second imaging optical system configured to capture a reflection image of the second target projected on the cornea; and a calculation controller configured to adjust the amount of projection light of the second projecting optical system based on the reflection image of the first target, the reflection image having been acquired by the first imaging optical system, and measuring the corneal shape of an examinee's eye based on the reflection image of the second target, the reflection image having been captured by the imaging optical system. | 10-31-2013 |
| 20130308100 | COLOR CODED TOPGRAPHER AND METHOD OF DETERMINING A MATHEMATICAL MODEL OF A CORNEAL SURFACE - A corneal topographer is described, the topographer comprising: —a multi-colored stimulator comprising a plurality of light sources arranged to form a multicolored pattern of source points for projecting a plurality of light rays onto a surface of an object of interest, such as a cornea; —a lens-camera system arranged to receiving a respective plurality of reflected light rays reflected of the surface of the object of interest, thereby forming a pattern of image points; —a computational unit for determining a mathematical model of the surface; the computation unit comprising a memory unit provided with color pattern information based on the multicolored pattern of source points of the stimulator; the computational unit being arranged to, for each of the plurality of reflected light rays, establishing a one-to-one correspondence between a source point and an image point based on the color pattern information; the computational unit further being arranged to construct, based on positions of the image points and positions of the corresponding source points, the mathematical model of the surface. | 11-21-2013 |
| 20140078468 | SYSTEM FOR DETERMINING THE TOPOGRAPHY OF THE CORNEA OF AN EYE - A system for determining the surface shape of the cornea of an eye by analyzing the reflection of a spatially distributed ring pattern. The system includes an element for generating a ring pattern, an illuminating unit, an image capturing unit, and a control and analyzing unit. The element for generating rings is a fresneled axicon with annular structures of different radii. Furthermore, an optical element for illuminating the entire surface of the fresneled axicon with plane waves and an optical element for separating the illuminating and detecting beam path are arranged between the illuminating unit and the fresneled axicon. Furthermore, the image capturing unit consisting of an imaging system and an image sensor is designed for a telecentric distance-independent image detection. | 03-20-2014 |
| 20140098346 | DEVICE AND METHOD FOR MEASURING A CORNEA - In order to measure a cornea with the aid of a projection (S | 04-10-2014 |
| 20140111773 | OPHTHALMOLOGIC APPARATUS, OPHTHALMOLOGIC CONTROL METHOD, AND PROGRAM - An apparatus includes a position detecting unit for detecting the position when a positioning unit completes positioning in a working distance direction, a first acquisition unit for acquiring information about a curvature radius of a cornea of a subject's eye, a second acquisition unit for acquiring information about an intraocular pressure of the subject's eye at a predetermined position in a movable range, which is set in the working distance direction in such a way as not to exceed a proximity limit position relative to the subject's eye, and a control unit for controlling the second acquisition unit based on outputs of the position detecting unit and the first acquisition unit in such a way as to maintain a predetermined distance between the cornea of the subject's eye and the proximity limit position in the working distance direction, regardless of the curvature radius of the cornea of the subject's eye. | 04-24-2014 |
| 20140253877 | INTRAOCULAR LENS THAT MATCHES AN IMAGE SURFACE TO A RETINAL SHAPE, AND METHOD OF DESIGNING SAME - An intraocular lens (IOL), system, and method having a base lens and a complementary lens selected to form a curved image surface matching a retina surface when placed in an eye's line of sight. | 09-11-2014 |
| 20140362345 | BINOCULAR MULTIPLEXING METHOD AND DEVICE - A binocular multiplexing device for a single-channel ophthalmological instrument for objective measurement of at least one vision parameter of a subject, the ophthalmological instrument including elements for generating a single light beam, elements for collecting a measurement beam by reflecting and/or refracting the light beam against the subject's eye and a sensor associated with the single measurement channel. The binocular multiplexing device includes optical separation first elements for receiving an image beam originating from a stimulus target and separating the image beam into a right and left ocular stimulation beam; optical switching elements for switching the single light beam selectively onto a right or left monocular light beam's optical path to form, after reflection and/or refraction by the eye in question, a right, respectively left, ocular measurement beam, and optical combination elements for superimposing the right, respectively left, ocular stimulation beam, and the right, respectively left, monocular light beam. | 12-11-2014 |
| 20150131055 | SYSTEMS AND METHODS FOR MAPPING THE OCULAR SURFACE - Examples of methods and apparatus for an accurate measurement of the anterior surface of the eye including the corneal and scleral regions are disclosed. The measurements provide a three-dimensional map of the surface which can be used for a variety of ophthalmic and optometric applications from astigmatism and keratoconus diagnostics to scleral lens fitting. | 05-14-2015 |
| 20150289758 | LED LIGHT PLACIDO DISC PROJECTOR FOR A CORNEAL TOPOGRAPHY SYSTEM - The present invention generally refers to corneal topography systems. More specifically, it regards a Placido disc projector (or simply Placido disc) for a corneal topography system, having a novel arrangement of LED lighting. | 10-15-2015 |
| 20160000322 | SYSTEM AND METHOD FOR CORNEAL TOPOGRAPHY WITH FLAT PANEL DISPLAY - A corneal topographer includes: a flat panel display configured to display a light pattern and to project the light pattern onto a cornea of an eye disposed on a first side of the flat panel display; an optical system disposed on a second side of the flat panel display, the optical system being configured to receive and process reflected light from the cornea that passes through the flat panel display from the cornea to the optical system; a camera configured to receive the processed reflected light from the optical system and to capture therefrom a reflected light pattern from the cornea produced in response to the projected light pattern; and one or more processors configured to execute an algorithm to compare the projected light pattern to the reflected light pattern from the cornea, and to produce a topographic map of the cornea based on a result of the comparison. | 01-07-2016 |
| 20160038020 | SYSTEMS AND METHODS FOR IMPROVED EASE AND ACCURACY OF GAZE TRACKING - Methods for improving gaze tracking are presented. These methods eliminate the need for a separate initial calibration step to determine whether the subject is properly centrally fixated during testing. In one embodiment, whether the subject is centrally fixated is determined by identifying inlier and outlier gaze descriptors; the inliers are assumed to be associated with central fixation. This reduces the total time required for testing. These methods also improve the accuracy of gaze tracking during testing without the need for individual subject calibration. Instead, a database of reference eyes is used. The subject's eye can be compared to the reference eyes, and the mapping function for one or more reference matches can be used to estimate the subject's gaze direction. In another embodiment, previous calibration data from the same subject can be used to determine whether the subject is properly centrally fixated and/or the direction of the subject's gaze. | 02-11-2016 |
| 20160128565 | MEASURING METHOD - In a method for registering measurement points on a body, in particular on an eye, measurement points are registered along a trajectory on a surface of the body, in particular a curved surface of the body, for determining an axial length profile, by way of a measurement beam. Here, a minimum radius of curvature of the trajectory is at least 1/7, preferably at least ⅕, particularly preferably at least ⅓ of a radius of a circumference of the surface. | 05-12-2016 |
| 20160135679 | OCULAR METROLOGY EMPLOYING SPECTRAL WAVEFRONT ANALYSIS OF REFLECTED LIGHT - Method and systems are presented for analysing a wavefront using a spectral wavefront analyser to extract optical phase and spectral information at a two dimensional array of sampling points across the wavefront, wherein the relative phase information between the sampling points is maintained. Methods and systems are also presented for measuring an eye by reflecting a wavefront of an eye and measuring the wavefront at a plurality of angles to provide a map of the off-axis relative wavefront curvature and aberration of the eye. The phase accuracy between wavelengths and sample points over a beam aperture offered by these methods and systems have a number of ocular applications including corneal and anterior eye tomography, high resolution retinal imaging, and wavefront analysis as a function of probe beam incident angle for determining myopia progression and for designing and testing lenses for correcting myopia. | 05-19-2016 |
| 20160198946 | Portable Corneal Topographer | 07-14-2016 |
