Matches 251 - 300 out of 349 < 1 2 3 4 5 6 7 >
Match Document Document Title
4861155 Method and apparatus for measuring curvature of the cornea  
Method and apparatus for measuring corneal curvature through mechanical measurement of longitudinal probe positioning in contacting the surface of the subject's cornea at predetermined radial and...
4859051 Eye testing apparatus  
An eye testing apparatus, in which a cornea reflecting image and a retina reflecting image formed by projecting each target mark image onto a cornea and a retina of an eye to be tested are...
4838682 Ocular topology system  
Topological information of the cornea and anterior chamber of an eye is optically developed by projecting toward said eye a target image sharply focused in a movable flat plane. As the plane is...
4834529 Apparatus and method for determining the symmetry of a surface  
Disclosed is an apparatus and method for determining the symmetry of a light reflecting surface by superimposition and comparison of a first reflected image ("first image") upon the same image...
4820039 Medical apparatus for diagnosing eye conditions  
Medical apparatus, a non contact measuring device, for use in diagnosing and monitoring various eye conditions, the apparatus including a camera having in the plane of the image a transparent...
4810085 Corneal configuration measuring apparatus  
A corneal configuration measuring apparatus is disclosed. It comprises target projecting means for projecting target beams from a plurality of targets towards a cornea of an eye to be tested, light...
4807989 Surgical microscope system  
A surgical microscope comprises an illuminating light source for observation and/or photographing, an observation optical system, an index projecting optical system and a cornea configuration...
4799784 Visual vertex finder  
An instrument and technique is disclosed for locating the exit point of the visual axis at the corneal surface. Several methods are described. One includes an optical device movable on the corneal...
4799785 Cornea contour mapping  
An apparatus and method for mapping the cornea is described. The apparatus comprises a probe having a multiplicity of parallel pins bundled together which are reciprocally movable with respect to...
4796989 Opthalmological measuring apparatus  
An ophthalmological measuring apparatus is disclosed. It comprises a projecting systems for projecting a target image to the cornea and retina of an eye to be tested, respectively, a measuring...
4795250 Ophthalmic apparatus  
An opthalmic apparatus in which the corneal reflection image of an illuminating light source for observing the front eye part of an eye to be examined is substantially prevented from mixing with...
4787734 Stereoscopic microscope  
A stereoscopic microscope including a stereoscopic optical system for observing an object under examination, an index projected on the object, a light-receiving unit for receiving an image of the...
4787743 Apparatus for measuring the radius of curvature  
A plurality of light sources are caused to impinge in predetermined directions onto an optical system to be inspected. The reflected beams from the optical system are received by two or more pairs...
4786163 Auto-keratometer  
An auto-keratometer attached to an operating microscope to measure the refraction and astigmatic condition of the cornea comprises a cornea irradiating light source section disposed below the...
4779973 Photokeratometric device  
A photokeratometric device for attachment to a photoslit lamp microscope having a light source therein comprises a keratometric pattern plate having an opening in the center thereof and a mount for...
4772115 Illuminated ring keratometer device  
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...
4770523 Apparatus for measuring curvature  
Apparatus for measuring curvature of an object automatically is so composed to guide two radiation beams reflected by the object to a linear image sensor, and determine the curvature of the object...
4768875 Arrangement for making contactless section-like measurements of the form of curved optically effective surfaces  
A light section is generated on the object with an arrangement for the contactless section-like form measurement of curved surfaces by means of an optical detector functioning in a raster-like...
4764006 Ophthalmic measuring apparatus  
An ophthalmic measuring apparatus has an ultrasonic detector for measuring the length of a predetermined region of an eye to be examined, a device provided with a center axis coaxial with the...
4761071 Apparatus and method for determining corneal and scleral topography  
An apparatus and method for determining the topography of the cornea and sclera that permit the detailed determination of the topography of the entire visible corneal and scleral surfaces; the...
4721379 Apparatus for analysis and correction of abnormal refractive errors of the eye  
The invention contemplates instrumentation to aid in performing refraction-corrective surgery on the cornea, (1) by determining the topography of the anterior surface of the cornea, the...
4710003 Cornea shape measuring apparatus  
In a cornea shape measuring apparatus wherein a chart for measurement is projected onto the cornea of an eye to be examined and the shape of the corneal reflection image thereof is detected through...
4692003 Real-time analysis keratometer  
A computer assisted keratometer in which a fiducial line pattern reticle illuminated by CW or pulsed laser light is projected on a corneal surface through lenses, a prismoidal beamsplitter...
4685140 Keratograph autoscanner system  
A computer-controlled system for displaying an image of a keratograph taken by a video camera on a video monitor and determining the position/dimensions of the Placido rings on the keratograph,...
4662730 Scanning keratometers  
A scanning keratometer for the rapid and accurate measurement and mapping of the corneal curvature is disclosed. The keratometer has a monochromatic light source directing light to a scanner,...
4660946 Cornea shape measuring method and apparatus  
A method and apparatus in which a predetermined index is projected onto the cornea of an eye to be examined and the shape of the cornea determining the refractive power, the degree of astigmatism,...
4660947 Methods and apparatus for use in ocular surgery  
Apparatus and method for use in ocular surgery to enable the surgeon to determine the degree of self correcting astigmatism to apply to the eye during the suturing procedure. The apparatus...
4650300 Luminous source for measuring device of the ocular parameters of a subject  
Luminous source of device for measuring, by means of corneal reflections, the ocular parameters of a subject. The source comprises a first extended emitting zone globally annular adapted to produce...
4632528 Method for determining refractive index of an object  
Method for determining a refractive index of an object in which the object is illuminated with a slit pattern of illumination light to form an optical section of the section of the object and the...
4606623 Method for measuring intraoperative and immediate postoperative effects of radial keratotomy  
A method and apparatus for measuring the intraoperative and immediate postoperative effects of radial keratotomy are provided. Essentially, the method includes the steps of measuring the...
4597648 Keratometer  
An improved keratometer instrument capable of measuring keratometric values of an eye is provided. An optical reference of a predetermined dimensional value is directed at the cornea of the eye and...
4588270 Curvature measuring apparatus  
A curvature measuring apparatus is provided for measuring the radii of curvature of a curved surface, particularly a human cornea or a contact lens. The apparatus comprises an illuminating optical...
4583830 Method and apparatus for measuring the shape of the eye  
Two plane-parallel prisms are placed in the optical axis of the examined eye, fitting close to each other in a horizontal plane lying in the optical axis. The prisms are rotated relative to one...
4582404 Sagometer  
An optical instrument which measures with great accuracy certain anatomical dimensions of an eye utilizing finite light beams which strike the eye from pre-determined angles and distances. The...
4572628 Method of and apparatus for measuring radius  
A method of measuring the radius of curvature of an object to be examined has a first procedure of projecting two pairs of light spots onto the object from different directions, a second procedure...
4569576 Method and device for determining cornea surface topography  
A device for determining the topography of the cornea surface, realizing a method for determining the cornea surface topography, comprises a frame carrying a light source, an objective lens, a...
4540254 Keratometer having peripheral light entrance and exit paths  
A keratometer is disclosed in which at least some of the light entrance and exit paths have both peripheral entrance and exit paths. Eye positional information and sphere, cylinder and axis...
4530579 Astigmatic ruler and method of use thereof  
An astigmatic ruler for determining an amount of astigmatism associated with a cornea of a human eye by qualitative methods comprises a target member having a plurality of apertures therethrough....
4491398 Hand-held keratometer  
A hand-held keratometer is formed of a handle mounting a circular ring of transparent material having a roughened surface to collect incident light and project a circle of light for use in...
4490022 Apparatus for corneal corrective techniques  
A quantitative corneascope for use with a surgical microscope in performing corrective techniques on the eye includes a pair of hinged image projection housing members movably mounted on each side...
4456348 Apparatus for examining eyes  
In an instrument for examination of the eye, which consists of a binocular telescopic magnifier and of an ophthalmological examination instrument, the main objective of the binocular telescopic...
4440477 Method and device for measuring the optical power of the cornea  
A method and device for measuring the optical power of the cornea is provided. The device comprises a light source to illuminate the cornea, apparatus for forming a profile image of the cornea,...
4439025 Variable circular dual image corneal radius measurement instrument  
An instrument (20) for measuring the radius of curvature of a cornea (58) of an eye (60) is provided. The instrument (20) includes structure (90, 98, 180) for projecting a reference image (70) onto...
4429960 Keratometric device  
A keratometric device for attachment to a surgical microscope, the device including a housing member configured for receiving the bottom portion of the microscope therein, a screw elevator member...
4426141 Bright ring keratoscope  
A hand-held keratoscope designed to project a bright circular ring on the cornea having a circular glass ring attached to a handle by a retainer ring with the circular glass ring having a flat...
4420228 Method and apparatus for analysis of corneal shape  
An analysis of the corneal shape through the combination of several keratometer measurements is disclosed. The eye is preferably scanned to a nasal angular position, a central angular position and...
4407572 Keratometer  
A keratometer is disclosed for remotely measuring corneal curvature in at least sphere, cylinder, and axis. Assuming the eye is precisely positioned from measurement, light sources are overlapped...
4390255 Eye-refractometer device  
An eye-refractometer device has a beam splitter, a projection optical system provided in one light path of the beam splitter for projecting a light beam into the pupil of an eye to be examined and...
4376573 Apparatus for measuring the refractive power of the eye  
In an apparatus having a ray generator for directing measuring rays through a first optical path, a light-receiving portion for receiving the measuring rays reflected by the eye fundus through a...
4375320 Dual image corneal radius measurement  
An instrument with a microscope brings into focus the cornea of a patient's eye for measurement of the radius of curvature of the cornea. Included is a pair of parallel spaced apart linear objects...
Matches 251 - 300 out of 349 < 1 2 3 4 5 6 7 >