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. 21, 1989
Filed:
Jan. 23, 1987
Richard T Schneider, Alachua, FL (US);
Richard H Keates, Columbus, OH (US);
Other;
Abstract
A perimeter having an image projection system which projects an undistorted line target across the full range of a patient's field of vision is disclosed. The image projection system includes a projector, a bundle of optical fiber elements, and lenses associated with the optical fiber elements adapted to focus the target onto the observation hemisphere of the perimeter. The perimeter may also be provided with a fixation monitor system which monitors the patient's gaze and which will interrupt projection of the target when fixation is lost. The fixation monitor includes at least one sensor for detecting the intensity of infrared light reflected off the patient's eye, and a comparator adapted to compare the output signals from each sensor during the examination with base signals obtained at fixation. Any signal variation will indicate that fixation has been lost and projection of the target will be interrupted. Projection will resume once fixation has been reestablished.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile