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:
May. 09, 2000
Filed:
Jan. 05, 1996
Charles Howard Caplan, Middleton, WI (US);
Richard A Buchroeder, Tucson, AZ (US);
Surgical Acuity, Inc., Madison, WI (US);
Abstract
A magnification viewer system includes a pair of magnification viewers adapted to be inserted into apertures in a pair of spectacle lenses to provide a relatively wider field of view and a lighter viewer system. Each magnification viewer includes a two-element objective lens and a single-element eyepiece lens. The doublet objective lens serves to reduce vignetting while providing a wide field of view and reduced chromatic aberration. Image quality may be further enhanced while keeping the weight of the viewer down through the use of light-weight high index glass for the objective lens. Moreover, the invention permits the use of interchangeable eyepiece lenses to provide a series of working distances, as well as interchangeable eyepiece segments to enable the magnification viewers to be corrected to the user's ophthalmic prescription. In order to reduce the criticality of the interpupillary distance, eyepiece lenses are formed with a 16 millimeter (mm) diameter.