Class / Patent application number | Description | Number of patent applications / Date published |
351237000 | Including target image projection | 17 |
20080259278 | Visual acuity testing apparatus - A visual acuity testing apparatus capable of performing visual acuity testing under substantially uniform conditions even when a test distance and an installation distance vary has a projection optical unit including a disk whereon a chart is placed, an illumination light source, and variable projection lenses which are moved so as to change an image-forming position and an image size of an image of the chart, an input unit into which an installation distance between the screen and the visual acuity testing apparatus and a test distance between the screen and an examinee are inputted, a projection lens driving unit which moves the variable projection lenses based on the installation distance and the test distance, and a light intensity adjusting unit which adjusts light intensity based on the installation distance and the test distance so that brightness of the chart image falls within a predetermined reference range. | 10-23-2008 |
20090153802 | Method and apparatus for the detection of impaired dark adaptation - The present method describes a new method for the measurement of dark adaptation. The dark adaptation status of subjects may ten be used to identify those subjects who are at risk of developing and/or who are currently suffering from a variety of disease states having their clinical manifestations in impaired dark adaptation. The disease states include, but are not limited to, age related macular degeneration, vitamin A deficiency, Sorsby's Fundus Dystrophy, late autosomal dominant retinal degeneration, retinal impairment related to diabetes and diabetic retinopathy. An apparatus for administering the test method described is also provided. | 06-18-2009 |
20090219486 | METHOD FOR OPTIMIZING AND/OR MANUFACTURING EYEGLASS LENSES - A method for determining an optimal eyeglass lenses design for a viewer ( | 09-03-2009 |
20100007850 | APPARATUS AND METHOD FOR SUBJECTIVE DETERMINATION OF THE REFRACTIVE ERROR OF THE EYE - The invention provides for a subjective refractor for determining refractive error of the eye comprising an optical system for presenting at least two targets to the eye, the difference of focus between the targets greater than the predicted depth of focus of the eye; —means for indicating target preference from the presented targets; and means for determining refractive error of the eye on the basis of target preference. | 01-14-2010 |
20100128223 | METHOD, ALGORITHM AND DEVICE FOR TESTING VISUAL ACUITY - This invention generally relates to a device and method for conducting visual acuity (VA) test and determining the size of a character presented during a VA test of a patient. The character size is selected from a predetermined allowed range of characters sizes. The method comprises steps selected inter alia from (a) obtaining minimal and maximal values; said minimal value is a size of which a character smaller than is unrecognizable for said patient; said maximal value is a size of which any character bigger than said maximal value is likely to be recognized by said patient; (b) obtaining a finite number, GAP, decreasing after each iteration so as to regulate the level of precision of the test; (c) predicting the patient's response; (d) presenting one or more characters and receiving the patient's response; (e) if the patient was correct, calculating character size in the range between the minimal value and the former character size; otherwise, calculating character size in the range between the maximal value and the form size; (f) updating said minimal and maximal values such that a new maximal value is decreased by a function of GAP and the minimal size; value is increased by a function of GAP; and, (g) terminating the test when GAP is smaller than a predetermined value and determine VA as the average between said updated minimal and maximal values. | 05-27-2010 |
20100195052 | Eye-administered, moving-image physiologic test methodology - A physiologic test methodology including (a) illuminating the central field in a test subject's eye with a relative-motion test image produced on an image display structure by a motion-image-creation structure, (b) by such illuminating, creating a related, subject-perception image, (c) requesting a subject report describing the observed presence and nature, if any, of a distortion, relative to the test image, in the perception image, and (d) thereafter utilizing such a report to assess a test subject's physiologic condition involving macular, paramacular, and neural-pathway physiologic degeneration. A preferred test image, which is fully adjustable by a test administrator with respect to substantially all of its image parameters, takes the form of an image field of elongate, spaced, parallel lines, having edges which distinctly contrast with a background field, and which move smoothly and linearly across the image field. | 08-05-2010 |
20100265463 | SUBJECTIVE REFRACTION METHOD AND DEVICE FOR CORRECTING LOW AND HIGHER ORDER ABERRATIONS - A subjective refraction technique uses a plane wave light source including substantially a point as a viewing target. The refraction method provide for a number of distinct identifiable end points. By finding such end points the process leads to an aberration-corrected vision. A defocus corrector assembly (DCA) includes a lens that is moveable along an optical axis between a patient's eye and the point light source for adjusting defocus power until the patient indicates that the blurry image has become a relatively focused line image. An astigmatism corrector assembly (ACA) which is capable of continuously variable in its amplitude is provided including a pair of astigmatism plates for adjusting astigmatism power and axis angle. The ACA is adjusted until the patient indicates that the line image has become a substantially round image. A reference marker provides displayed items including a sweep line overlapping at the point source and having an orientation which is adjustable. The patient may subjectively control the sweep angle of the sweep line and indicate that the sweep line is aligned with the sharp line image of the point source, thereby providing axis angle data of astigmatism errors of the patient's eye. | 10-21-2010 |
20110025980 | PERSPECTIVE VISION TUNNEL - Devices and methods for testing a subject's visual ability are provided. More specifically, the device may include a perspective vision tunnel comprised of plurality of low reflectance walls with one or more mirrors arranged within the perspective vision tunnel. Visual indicia for administering the test of a subject's visual ability are displayed into a first portion of the perspective vision tunnel. The one or more mirrors are arranged to reflect the visual indicia out of the first portion such that visual indicia may be visually perceived by the subject. In accordance with the invention, a subject may be tested utilizing the perspective vision tunnel and input may be received from the individual. The received input may then, for example, be used to compute data related to the user's visual ability. | 02-03-2011 |
20120081669 | EYESIGHT TESTING APPARATUS - An eyesight testing apparatus includes an imaging device for virtual imaging a test object located within a focal length of the imaging device and imaged at different distances into eyes of a subject located in a focal point of the imaging device, an optical deflection device arranged in a beam path between the imaging device and the test object to deflect the beam path by 180°, wherein the deflection device is displaceable in the direction of the beam path and the test object is not, a monitor device that generates the test object and that comprises a single monitor, optical components lying in the beam path sized so that both eyes are able to take part in a test, and so a partial beam path is formed for each eye, and a blocking device arranged in the beam path, which comprises two LCD blocking elements for the partial beam paths. | 04-05-2012 |
20120113394 | METHOD FOR OPTIMIZING AND/OR MANUFACTURING EYEGLASS LENSES - A method for determining an optical eyeglass lenses design for a viewer comprising the successive steps of: showing the viewer a stereoscopic scene, said scene being shown with optical effects of the first lens design; expressing the viewer's opinion; showing the viewer a stereoscopic scene including optical effects of a modified lens design; introducing a relative movement between the viewer and the shown stereoscopic scene, and said scene being shown with the modified lens optical effects; expressing again the viewer's opinion; repeating the three last steps up to viewer's satisfaction. A system for customizing vision correction suitable to implement said method. Related computer program for dynamically calculating a stereoscopic image. Related computer program for actuating an electro-active component. | 05-10-2012 |
20120140181 | OPHTHALMIC APPARATUS AND HESS TEST APPARATUS - An ophthalmic apparatus includes: a screen; a examination controller; a first image projection unit projecting a target image; a second image projection unit projecting a pointer image; a mirror reflecting the projections of the first and second image projection units to project the same onto the screen; and a pointer operation input unit through which the pointer position is inputted. The examination controller includes: a first image generation unit generating a target image; an image correction unit correcting the target image so that the target image does not look distorted on the screen; a calculation storage unit calculating the position of the pointer according to the input through the pointer operation input unit and storing the calculated position; a second image generation unit generating the image of the pointer; and an output unit presenting or outputting the target image and the position of the pointer. | 06-07-2012 |
20120206694 | Methods and Apparatus for Cataract Detection and Measurement - In exemplary implementations of this invention, cataracts in the human eye are assessed and mapped by measuring the perceptual impact of forward scattering on the foveal region. The same method can be used to measure scattering/blocking media inside lenses of a camera. Close-range anisotropic displays create collimated beams of light to scan through sub-apertures, scattering light as it strikes a cataract. User feedback is accepted and analyzed, to generate maps for opacity, attenuation, contrast and sub-aperture point-spread functions (PSFs). Optionally, the PSF data is used to reconstruct the individual's cataract-affected view. | 08-16-2012 |
20130286352 | METHOD AND APPARATUS FOR MEASURING A PROPERTY OF AN EYE OF A SUBJECT - According to a first aspect of the present invention, there is provided a method of measuring a property of an eye of a subject using an apparatus which is: arranged to provide a bleaching light, a background light ostensibly invisible to rods (e.g. substantially red, and/or having or being a wavelength greater than 580 nm) and a target light ostensibly visible to rods (e.g. substantially green, and/or having or being a wavelength less than 580 nm and greater than 400 nm, e.g. around 514 nm+/−50 nm), the background light and/or target light (together) being suitable for rod-dominated stimulation, the background light and target light being superimposable upon one another, and the target light being presentable to the subject such that the target light is incident on a parafoveal region of the subject's retina; the method comprising: a) stimulating the subject's retina with a low level bleach using the bleaching light; b) after the bleach has been undertaken, modulating a target light at an initial luminance at which modulation of the target light is not perceivable by the subject, whilst a background light remains substantially constant; c) increasing the luminance of the modulated target light; d) receiving an input from the subject when modulation of the target light is perceivable by the subject, thus indicating a rod-related threshold; e) after said input, decreasing the luminance of the modulated target light; and f) repeating parts c) to e) of the method to determine a series of rod-related thresholds over a period of time. | 10-31-2013 |
20140185012 | OPTOMETRY APPARATUS - An optometry apparatus includes; a housing accommodating a concave mirror disposed on a reference axis; and a display disposed outside the housing and out of the reference axis for projecting a target light flux onto the concave mirror. The concave mirror is configured to reflect the target light flux output from the display toward an examinee's eye along the reference axis. | 07-03-2014 |
20140211165 | SUBJECTIVE EYE REFRACTING POWER MEASUREMENT APPARATUS - There is provided a subjective eye refracting power measurement apparatus which measures a refracting power of a subject eye. The apparatus includes a projection optical system which projects a visual target light flux toward the subject eye to form a visual target on a fundus of the subject eye; a correction optical system which changes a refracting power thereof; a relay optical system which relays a light flux passing through the correction optical system and to form an image of the correction optical system in front of the subject eye; a deviation detector which detects a positional deviation of the image of the correction optical system with respect to the subject eye; and a correction unit which optically corrects a formation position of the image based on a detection result by the deviation detector such that the image is formed in front of the subject eye. | 07-31-2014 |
20150305615 | Method and Apparatus for the Detection of Impaired Dark Adaptation - The present method describes a new method for the measurement of dark adaptation. The dark adaptation status of subjects may then be used to identify those subjects who are at risk of developing and/or who are currently suffering from a variety of disease states having their clinical manifestations in impaired dark adaptation. The disease states include, but are not limited to, age related macular degeneration, vitamin A deficiency, Sorsby's Fundus Dystrophy, late autosomal dominant retinal degeneration, retinal impairment related to diabetes and diabetic retinopathy. An apparatus for administering the test method described is also provided. | 10-29-2015 |
20150305616 | Method and Apparatus for the Detection of Impaired Dark Adaptation - The present method describes a new method for the measurement of dark adaptation. The dark adaptation status of subjects may then be used to identify those subjects who are at risk of developing and/or who are currently suffering from a variety of disease states having their clinical manifestations in impaired dark adaptation. The disease states include, but are not limited to, age related macular degeneration, vitamin A deficiency, Sorsby's Fundus Dystrophy, late autosomal dominant retinal degeneration, retinal impairment related to diabetes and diabetic retinopathy. An apparatus for administering the test method described is also provided. | 10-29-2015 |