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:
Feb. 14, 1978
Filed:
Apr. 21, 1975
Robert C Welsh, Coconut Grove, FL (US);
Other;
Abstract
A spectacle lens having an anterior surface curvature, the anterior surface having a spherically shaped central vision surface area from 12 to 16 diopters and a peripheral, aspherical surface area surrounding the center vision spherical area, the aspherical surface area formed with a uniform diopter gradient varying from the central vision surface area edge to the outer circumference of the lens. The aspherical diopter rate of change, approximately one-third diopter per millimeter which is reduced from the spherical area toward the outer lens circumference, improves the peripheral vision of a person having aphakia when looking through the central vision portion, while eliminating the pin cushion effect found in conventional lenses which result from overpowering in the outer areas of the lens. The lens is useful for improving the vision of one having aphakia when looking through the central vision area and teaching the patient to rotate his head rather than his eyes to more clearly observe objects by re-establishing a new center vision point.