The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 27, 2001
Filed:
Feb. 22, 1999
Robert K. Maloney, Pacific Palisades, CA (US);
Jeffrey L. Stewart, Greenwich, CT (US);
Visionrx.Com, Inc., Elmsford, NY (US);
Abstract
An apparatus for assessing the visual field of a patient is disclosed which utilizes a virtual image of a visual stimulus. The disclosed apparatus includes a light pattern generator which generates a visual stimulus, such as a moving fixation target, and an optical assembly which produces a virtual image of the visual stimulus projected a distance in front of the patient's eye. During measurement of the patient's visual field, the patient observes the virtual image of the visual stimulus. A centration illumination source, such as an infrared laser, also illuminates the patient's pupil with an infrared beam, which is then scattered off the patient's iris. In operation, the apparatus monitors the patient's fixation on the visual stimulus by tracking the movement of the patient's pupil using the scattered infrared image. When the center of the pupil image moves beyond a predefined threshold, a lost of fixation is indicated, from which the patient's visual field can be assessed.