Matches 201 - 250 out of 437 < 1 2 3 4 5 6 7 8 9 >
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5420650 Eye examining apparatus including an eye refraction measuring system and eye fundus examining system  
The present invention relates to an eye examining apparatus used in ophthalmic clinics. In an eye refractometer provided with a light beam separating member for separating an eye fundus...
5418582 Photokeratoscope apparatus and method  
An improved photokeratoscopic method and apparatus for measuring corneal curvature and topography. The principal of parallax is used by generating a reference light point outside of the relevant...
5412442 Apparatus for photographing a corneal endothelium  
An apparatus for photographing an endothelium of a cornea comprising an apparatus optical system including an anterior portion observing optical system for observing the anterior portion of an eye...
5396303 System and method for projecting an image (such as an ERG pattern) onto the retina  
A pattern ERG (PERG) projector includes a coherent light source (32) for generating a projection beam, modulation optics (34) for modulating the projection beam with an alternating ERG interference...
5394200 Automatic keratometric measuring method and device for implementing said method  
The device comprises a luminous source 3 in the form of a circular ring, an optical doublet 4 and a matrix camera 5 on the lens of which the doublet 4 carries the elliptic image of the source 3...
5387951 Intraocular length measuring instrument capable of avoiding errors in measurement caused by the movement of a subject's eye  
An intraocular length measuring instrument according to the invention can avoid errors in measurement caused by the movement of a subject's eye, such as a blink or involuntary eye movement, and...
5382988 Stereoscopic retinal camera with focus detection system  
A stereoscopic retinal camera is provided with an illumination optical system for illuminating the fundus of an examinee's eye, an observing/photographing optical system for observing and...
5382989 Apparatus for examining gaze shift in depth direction  
In an apparatus for examining gaze shift in depth direction, light emitting diodes B and E, or D and C are lit at a plurality of positions with different distance in depth direction from the...
5381194 Apparatus for photographing a corneal endothelium  
An apparatus for photographing a corneal endothelium of a patient's eye according to the invention includes an optical system for observing the anterior segment of the eye to align optical systems...
5371557 Stereoscopic retinal camera  
A stereoscopic retinal camera comprises an illuminating optical system, a photographing optical system, an observation optical system and a focus detection optical system. The focusing optical...
5357293 Apparatus for analyzing depth perception  
An image at a distant point and an image at a close point for generating depth perception of a subject are displayed on an image display monitor, and eye movement of the subject at that time is...
5349398 Ophthalmometer system  
An ophthalmometer system is provided which includes a white light source for illuminating a cornea during surgery, along with an infrared light generator for imaging concentric rings onto the...
5349399 Intraocular length measuring instrument having phase compensating means  
To obviate the influence of, for example, birefringence of an eyeball, an intraocular length measuring instrument includes a light source portion for emitting a measuring beam of linearly polarized...
5347331 Ophthalmic apparatus for photographing the anterior part of the eye with a reproducible photographing position  
Ophthalmic photographing apparatus for photographing an anterior part of examinee's eye provides an alignment optical system including a reflection image forming device for forming an image...
5347328 Apparatus for measuring an intraocular length between anterior and posterior portions of an eye  
An apparatus for measuring an eye axial length includes a measuring optical system for projecting laser beam onto an eye and making interference between light reflected by the cornea of the eye and...
5347327 Process and apparatus for measuring axial eye length  
A process and apparatus for measuring an axial eye length takes the steps of projecting monochromatic coherent light of which wavelengths are variable onto an eye to be tested, causing an...
5341180 Ophthalmic photographing apparatus  
Ophthalmic photographing an image of an eye to be examined comprises: frame memory for memorizing the image data of the photographed eye, light detecting device for detecting an amount of the light...
5339120 Retina evaluation reticle apparatus  
A retina evaluation reticle apparatus for use in a slit lamp biomicroscope and removably positioned at the focusing point of the slit lamp biomicroscope and spaced therein from a patient to be...
5329322 Palm size autorefractor and fundus topographical mapping instrument  
A schematic is disclosed for an optical instrument with a compact light path for incorporation to a hand held instrument for objective refraction of the eye. In particular, and after eye centering...
5329321 Intraocular length measuring instrument with rotary optical path length variator  
An intraocular length measuring instrument in which a measuring optical path is formed via an eye to be tested, and a reference optical path having a variable optical path length is formed within...
5325134 Keratometer  
A keratometer in which at least three point sources of light in an area exceeding a semicircular area are projected onto the cornea of an eye to be examined and the center of an ellipse is...
5325135 Ophthalmologic apparatus having two measuring systems  
An apparatus capable of simply and accurately measuring cornea refractive power and eye axis length at least necessary to select a proper in-the-eye lens for an eye to be examined without moving a...
5319398 Method of and apparatus for testing visual functions of human eyes  
A computerized perimeter is utilized to examine the field of vision of a subject's eye while the eye is located at or at least close to a predetermined position in which the optical axis of the eye...
5319399 Optical alignment device  
An optical device for aligning an instrument so that active zones in the instrument are the same distance from the plane of a remote object comprising a lens attached to the instrument, the lens...
5317389 Method and apparatus for white-light dispersed-fringe interferometric measurement of corneal topography  
An novel interferometric apparatus and method for measuring the topography of aspheric surfaces, without requiring any form of scanning or phase shifting. The apparatus and method of the present...
5315329 Simultaneous stereo fundus camera  
A stereo eye fundus camera capable of simultaneously recording a stereo pair of images of the fundus of an eye of a patient onto color photographic film for processing into a 3-D color photograph...
5311225 Device for determining the portion of a field seen by the eye of an observer  
Device intended to determine the portion of a field seen by the eye (5) of an observer. According to the invention, this device includes: an optical sighting system (2, 3) through which said eye...
5309186 Eye refractive power measuring apparatus having opacity discriminant function of crystalline lens  
An eye refractive power measuring apparatus having an opacity discriminant function of a crystalline lens comprising a projecting optical system for projecting a target for eye refractive power...
5302979 Ophthalmic apparatus capable of measuring the shape of a cornea  
An ophthalmic apparatus includes a first index mark provided as an index mark for measuring the shape of a cornea substantially on the optic axis, a second index mark provided around the optic...
5300965 Corneal shape measuring apparatus  
This invention provides a corneal shape measuring apparatus that can correctly measure the shape of the cornea of a subject's eye from an image of a target reflected by the cornea even if the optic...
5298927 Visual axis detecor having a high sensitivity to a light from an eye  
A visual axis detector includes an illumination device for illuminating an eye; an optical device for guiding light from the eye; the light being in a form of a light intensity distribution having...
5285223 Ophthalmic optical apparatus having an alignment optical system  
An ophthalmic optical apparatus having an alignment optical system comprises two conical optical elements for forming an alignment light beam into a ring-shaped collimated light beam centered on an...
5280312 Visual axis detection apparatus  
A visual axis detection apparatus in which an eye of an observer is illuminated by a light source, and the corneal reflection image of the eye and the reflected image of the iris are detected by a...
5280313 Ophthalmic measuring apparatus  
An ophthalmic measuring apparatus for easily determining whether an ametropia of an eye to be tested is caused by an abnormality in the length of the ocular axis or an abnormality in the lens or...
5270749 Opthalmic apparatus for measuring the refractive power of a lens  
An ophthalmic apparatus has a diopter adjustment which adjusts the diopter of a target presented to an eye under test based on measurement of the refractive index of a lens put on the eye under...
5258791 Spatially resolved objective autorefractometer  
A spatially resolved map of the eye's refractive characteristics are provided by measuring the eye's refractive characteristics on a point-by-point basis across the anterior surface of the eye....
5255026 Stereo eye fundus camera  
A stereo eye fundus camera has an illuminating optical system for illuminating the fundus of an eye to be tested through an objective lens, and a taking optical system for taking the eye fundus...
5255027 Eye testing device  
A vision-testing apparatus includes a concave mirror and at least one test object (2) which can be changed in position and is arranged between the concave mirror (1) and its focal point (f) in a...
5249003 Ocular refractivity measuring apparatus  
An ocular refractivity measuring apparatus includes a light receiving optical system, an illuminating optical system, an imaging device and a calculator. The light receiving optical system includes...
5249004 Microscope for an operation  
A microscope for an operation for measuring the refraction of an eye. The microscope has a measuring device for measuring the refraction of an eye to be tested and can achieve its miniaturization...
5223866 Small, simple and cost-effective scheiner-principle optometer with computer interface for automated assessment  
A Scheiner-principle optometer for automated assessment of accommodative state is disclosed. The specific advantages of the instant invention over earlier ones are: a) simplicity of design, b) hand...
5210554 Pupil pathway analyzer  
A pupil function analyzer has three major subsystems; an electro-optical system, an electronic interface system and a computer/software system. The electro-optical system can, in turn, be described...
5210555 Ocular refracting power measuring system  
The ocular refracting power measuring system according to the present invention comprises a projector system having a measuring light source emitting light beam rotatable around optical axis and...
5208619 Automatic refractor, lensmeter and keratometer utilizing Badal optics  
Badal optics are disclosed in which an aperture array at an optical system under test is interrogated for the deflection of light between a detector array conjugate with the aperture array of the...
5202708 Apparatus for photographic retroillumination image on eyeground  
A retroillumination image photographing apparatus of a crystalline lens in which an eye to be examined is projected by illumination light, and a crystalline lens is retroillumination with reflected...
5202710 Fixation card attachment for retinoscope  
A fixation card attachment for an eye examination instrument that enables the card to be positioned in reference to the optical path of the instrument so that the patient undergoing examination...
5196872 Data acquistion and pupil tracking apparatus for an ophthalmologocial instrument  
A pupil function analyzer has three major subsystem; an electro-optical system, an electronic interface system and a computer/software system. The electro-optical system can, in turn, be described...
5189449 Retinoscope with external control sleeve  
A streak retinoscope has an external control sleeve that is fully rotatable and is movable axially for rotating the lamp and focusing the lens assembly, respectively. The lens assembly is carried...
5157427 Objective refractor  
An objective refractor having no moving parts is disclosed. The refractor, which can be either a hand held or table mounted instrument, includes a reference array and an interrogating array...
5148231 Apparatus for measuring a refracting power of an optical system  
An apparatus for measuring a refracting power of an optical system which comprises: a beam projecting optical system which projects a predetermined moving luminous flux to an optical system to be...
Matches 201 - 250 out of 437 < 1 2 3 4 5 6 7 8 9 >