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. 10, 1987
Filed:
Apr. 14, 1982
Applicant:
Inventor:
Michael H Freeman, Denbigh, GB;
Assignee:
Pilkington P.E. Limited, , GB;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
A61F / ; G02C / ; G02C / ;
U.S. Cl.
CPC ...
623-6 ; 3511 / ; 351161 ; 351162 ; 351163 ;
Abstract
A contact lens has a transmission hologram which provides diffractive power on a wavelength and/or amplitude selective basis whereby light from near and distant objects can be focussed on the retina of a presbyopic wearer. Similarly an implant lens can have a transmission hologram to correct for non-accommodative vision. The invention is particularly useful in providing an artificial eye lens with a bi-focal action without need for distinct near and far vision zones.