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:
Nov. 26, 1996
Filed:
Oct. 11, 1994
Peter C Magnante, West Brookfield, MA (US);
Leo T Chylack, Jr, Duxbury, MA (US);
David Miller, Brookline, MA (US);
Other;
Abstract
Cataract and other diseases of the eye which degrade the clarity of the ocular media cause blurred vision and sensitivity to glare. Vision tests that require patients with unclear ocular media to read letter charts are not always reliable indicators of vision loss because these tests are sensitive to such subjective variables as patients' reading and language skills as well as neurological status. The invention provides a non-invasive means for the objective assessment of vision loss in patients with unclear ocular media thus overcoming the difficulties associated with subjective vision tests. The methods and devices of the invention provide the means for: 1) projecting the image of an external target source onto the patient's retina, 2) forming a second image of the retinal image of the target source onto the recording plane of an electronic camera, 3) transferring the electronic image to an image processing computer, and 4) measuring the extent of blurring of the retinal image of the target source with the computer. Vision loss is associated with the magnitude of the measured extent of the blurred retinal image.