Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Reexamination Certificate
2000-03-24
2001-09-18
Manuel, George (Department: 3737)
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
Reexamination Certificate
active
06290357
ABSTRACT:
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention is in the field of devices and methods for testing the visual field characteristics of a patient.
2. Background Art
Visual field testing remains the “gold standard” for diagnosing diseases of the optic nerve and the visual system. Ideally, a visual field testing system would objectively measure the visual field of a patient without any subjective response whatsoever on the part of the patient. However, currently known visual field examinations require great concentration on the part of the patient and can be tedious and frustrating to the point of annoyance. Current techniques involve a globe-type visual field tester, called a “perimeter,” such as those manufactured by Humphrey Instruments, Dicon, Octopus, and others. These conventional visual field testers generally require that a patient continuously fixate upon a central point, while lights are displayed sequentially into the peripheral field. When the patient sees the light out of the corner of the eye in the peripheral visual field, the patient responds by pressing a button, or responding verbally, all the while being strictly required to maintain central fixation. Generally, central gaze must be maintained without interruption for up to 10 minutes. This requires maximal concentration by the patient.
BRIEF SUMMARY OF THE INVENTION
The present invention provides a novel and much more “user-friendly” device and method for testing the visual field of a patient suspected of having glaucoma, or other disease affecting the visual system and corresponding neurological pathways. This new invention virtually eliminates the tedium inherently present in conventional perimeter globe-style visual field testers. In the present invention, the patient wears a head-mounted display, with a gaze fixation target. Various visual stimuli, such as icons of various shapes, sizes, colors, and luminosity, are displayed for the patient to observe, at various locations throughout the display. The patient signals his observation of these stimuli only by shifting his gaze from the gaze fixation target to the visual stimuli, then back to the gaze fixation target.
The novel features of this invention, as well as the invention itself, will be best understood from the attached drawings, taken along with the following description, in which similar reference characters refer to similar parts, and in which:
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Braeuning Johannes
Massengill R. Kemp
McClure Richard J.
Manuel George
Spinks Gerald W.
Virtual-Eye.com, Inc.
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