Computed Anatomy Incorporated

Other

Ohm Acoustics Corporation

Martin Gersten

Roy Maus

Lars Tibbling

Richard James Mammone

Joseph L Zelvin

Anthony P Cappo

Roy C Maus

Tomohiro Matsuzaki

Gervey E Mosquera

Degradations of the image acquired by a fundus camera, including those due to intraocular defects are reduced by digitizing the image, taking an FFT of row and column image data, correlating the FFTs of the rows and of the columns to obtain resultant row product vectors and column vectors. The Nth root of the resultant row and column product vectors is computed, where N is the respective numbers of rows and columns. A minimum offset term is subtracted from each element of the resultant vector to obtain the PSF spatial spectrum (MTF) of the eye. Each row FFT and each column FFT is then divided by the MTF after which the inverse FFT yields a restored distortion-reduced image.

Fundus imaging

An ophthalmic apparatus has instrumentation for performing an ophthalmic procedure on a patient's eye when the patient and the instrumentation are aligned with each other with respect to orthogonal X, Y, and Z axes. The Z axis specifies the distance of the eye from the instrumentation. A signal generator generates an initiation signal to initiate alignment of the instrumentation and the eye. An X-Y alignment apparatus and a Z alignment apparatus each respond to the initiation signal to cause alignment along their respective axes and then determine when the instrumentation and the eye are in predetermined relative positions along the Z axis. The X-Y alignment apparatus and the Z alignment apparatus each generate a respective alignment signal. A controller receives the Z alignment signal and the X-Y alignment signal and issues a control signal to the instrumentation to perform an ophthalmic procedure in response to the alignment signals.

Device for performing ophthalmic procedures with improved alignment

Compact keratoscope with interchangeable cones

Color-coded corneal topographic information contained in a polar plot of plurality of different traces taken over the corneal surface, such as that disclosed in the U.S. Pat. 4,863,260, is reprocessed to present the color topographic map in a 'hills and valleys', Cartesian coordinate display; polar position being presented along the x-axis and elevation being presented along the y-axis. The different circular traces are separated one from the other in a perspective dispersion to emphasize the elevation data with the more apical traces being presented at one end and the more limbal trace being presented at the other end of the perspective dispersion.

Method for displaying corneal topography

Method for accurately displaying the location of the pupil perimeter on a corneal topography map such as is disclosed in the prior art Gersten et al., U.S. Pat. No. 4,863,260. In the process of deriving such topographic information, the process disclosed in that patent obtained a two-dimensional video image of the cornea. In the method of the present invention, the background illumination of the video image is sampled and the video signal is corrected for the effects of camera distortions, artifacts, and specular glare. The corrected data is analyzed and the point at which the greatest rate of change in background illumination occurs is determined to be a point on the periphery of the pupil. The peripheral points so determined are then displayed in superposition to the corneal topographic map thereby indicating the pupil outline.

Mapping of corneal topography with display of pupil perimeter

A cylindrical keratoscope is provided with an improved structure for illuminating the rings disposed along the length of its bore by having the light-transmitting rings defined as the lands between a series of opaquely coated, incised circular grooves in the bore. A circular, fluorescent, light tube is disposed in an aluminum light box having a semi-toroidal concavity provided with a light-reflecting surface to direct or collimate the light from the tube toward the light-receiving base of the device.

Illuminated ring device

A keratoscopic instrument capable of automatically compensating for the different optical characteristics exhibited by any of a set of mechanically interchangeable illuminated ring devices without manual recalibration includes on the base portion of each light ring device a plurality of distinctive, light pervious, machine-readable indicator spots illuminated from the keratoscope light source and arranged in a code indicative of the optical characteristics of the ring device in place. Marking information is detected and communicated to a computer controlled image processing system wherein the detected information is automatically utilized, in conjunction with other input data, to process the image.

Interchangeable keratoscope device

Apparatus and method for accurately quantifying the instantaneous radius curvature of a large plurality of points on the corneal surface is disclosed. A video image of the corneal surface accurately positioned at a predetermined point on the optic axis of measurement is obtained. The predetermined point is defined by intersecting low power laser beams. The video image is radially scanned from an original position at point defined by the intersection of the visual axis with corneal surface. Accurate measurements of the two-dimensional image radii of a plurality of illuminated mires reflective upon the corneal surface are made and corrected for camera distortions, quantization error and the different magnification occurring for different size corneas. The instrumentation is calibrated by using a plurality of mirror-like spheres of precisely known spherical radii.

System for topographical modeling of anatomical surfaces

A device for causing concentric circles of illuminated light to be reflected from the human cornea. The device includes a cylindrical surface which is open at both ends. At one end the eye looks into the cylinder of the device and at the other end a camera or observer can view the illuminated rings on the cornea. The cylinder is advantageously made of transparent plastic or glass having an opaque coating. A lamp box is affixed to an uncoated portion of the device. The coating of the cylindrical surface through is interrupted to define clear rings on the cylindrical surface which light from the lamp box is conducted to be reflected from the cornea.

Illuminated ring keratometer device

A loudspeaker voice coil assembly having improved power handling capability is disclosed. The voice coil is wound of rectangular cross section aluminum wire having flexible anodized coating. A thin anodized aluminum retaining cylinder is adhered to the winding of the voice coil with a thin coating of a cement. The anodization serves not only to electrically insulate the turns one from another and from the aluminum, heatradiating retainer, but also serves to enhance the efficiency of the cement bonding. Voice coils capable of continuously dissipating 150 watts rms audio power have successfully been fabricated.

Growing community of inventors

New York, NY, United States of America

Martin Gersten