Apparatus and method for visual-field testing
First Claim
1. Apparatus for measuring a subject'"'"'s response to a light stimulus, over the subject'"'"'s visual field, comprising:
- an ocular device adapted to be placed over a subject'"'"'s eye, including a transparent window defining an outwardly projecting, cavity-like inner surface dimensioned to encompass the subject'"'"'s visual field in that eye,an optical system for producing a fixed-position image at one position in the subject'"'"'s visual field, and a series of transient light images at different selected positions in the subject'"'"'s visual field, andilluminating means for illuminating said surface to provide a substantially uniform glow on said inner surface, against which said fixed-position image and transient images may be perceived.
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Accused Products
Abstract
Apparatus and method for visual-field testing. The apparatus includes an ocular device which fits over a subject'"'"'s eye and which has a cavity-like inner surface dimensioned to encompass the subject'"'"'s visual field. The ocular device is constructed to provide a background glow against which a fixed light image and a series of transient, different-position light image in the subject'"'"'s visual field can be perceived. The images are preferably formed by a Badal-optical system which allows the images to be perceived without the need for corrective lenses. Also disclosed is a tandem-optics system for coordinately focusing fixed- and movable-position light image assemblies.
16 Citations
20 Claims
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1. Apparatus for measuring a subject'"'"'s response to a light stimulus, over the subject'"'"'s visual field, comprising:
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an ocular device adapted to be placed over a subject'"'"'s eye, including a transparent window defining an outwardly projecting, cavity-like inner surface dimensioned to encompass the subject'"'"'s visual field in that eye, an optical system for producing a fixed-position image at one position in the subject'"'"'s visual field, and a series of transient light images at different selected positions in the subject'"'"'s visual field, and illuminating means for illuminating said surface to provide a substantially uniform glow on said inner surface, against which said fixed-position image and transient images may be perceived. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for measuring a subject'"'"'s response to a light stimulus, over the subject'"'"'s visual field comprising
placing over the subject'"'"'s eye an ocular device having a transparent window defining an outwardly projecting, cavity-like inner surface dimensioned to encompass the subject'"'"'s visual field in that eye, producing a fixed-position image at one position in the subject'"'"'s visual field, producing a series of transient light images at different selected positions in the subject'"'"'s visual field and, illuminating said surface to provide a substantially constant, uniform low on the surface against which said fixed-position image and such transient images may be perceived.
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15. A tandem optical system for use in a visual testing of a subject comprising:
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(a) a frame arm; (b) a stimulus arm, which is movable in a three-dimensional region which is at a fixed distance from the subject; (c) fixed-image and movable-image assemblies carried on said frame arm and said stimulus arm respectively, each having (i) a light source and (ii) a focusing means which is movable with respect to said light source to change the focus of the light produced thereby as seen by the subject; (d) releasable brake means in the movable-image assembly for holding the light source and focus means at a fixed distance from one another when the brake is engaged, and allowing such distance to be changed when the brake is released; (e) a coupling device associated with said fixed-position image assembly for movement toward and away from a position of engagement with said brake means, including means for releasing said brake means at such points of engagement, and; (f) registration means associated with said fixed and movable image assemblies for maintaining the fixed-position and movable-position assemblies so that any change in the relative position of the light source and focus means of the fixed-position image assembly produces an identical change in the relative position of the light source and focus means of the movable-image assembly. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification