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:
Oct. 08, 1991
Filed:
Sep. 30, 1988
Osamu Katsumi, Winchester, MA (US);
Yoshitaka Miyanaga, Kawasaki, JP;
Eye Research Institute of Retina Foundation, Boston, MA (US);
Abstract
A method and apparatus for evaluating a human visual function employ a set of test objects that have viewing surfaces. One viewing surface bears no visually perceptible pattern and hence is visually homogeneous. Other viewing surfaces bear patterns of selected different coarseness corresponding to different visual acuities. The viewing surfaces preferably are otherwise visually identical and have selected luminosities. An examiner can readily evaluate a visual acuity function of a wide range of subjects, including infants, by observing the subject's eye motion to determine whether the subject distinguishes a perceptible pattern from the homogeneous pattern.