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:
Jun. 19, 1990
Filed:
Jul. 29, 1988
Akira Kitani, Fussa, JP;
Hoya Corporation, Tokyo, JP;
Abstract
A progressive power omnifocal lens (1, 5) for constituting spectacles having for vision and near vision focuses, having an area in which the refacting power progressively changes (successively increases) from upper to lower positions in the vicinity of the horizontal center of the lens; and a main fixation line (4, 6) generally called an 'umbilical meridian' formed in the progressive-change area, in which the degree of astigmatism along the main fixation line is substantially zero, and the main fixation line is gradually displaced toward the nose in accordance with the convergence of the eyes as it extends from an upper position to a lower position. The disposition of the main fixation line displaced toward the nose is varied depending upon the addition of the lens in such a manner that it is shifted upward as the addition of the lens is reduced, thereby optimizing the performance of the lens for a particular user.