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. 07, 2000
Filed:
Jan. 22, 1999
Ian E Murdoch, Bucks, GB;
D Allstair Laidlaw, London, GB;
Dan A Rosser, Highgate, GB;
Fred W Fitzke, London, GB;
University College London, London, GB;
Moorfields Eye Hospital NHS Trust, London, GB;
Abstract
An improved visual acuity chart is disclosed. The ratio of the size of the optotypes of neighbouring lines on the chart is a constant and preferably the size decrement between lines is 0.1 logMAR. Each line of optotypes has two, three or four optotypes, preferably three. Crowding bars for visual acuity charts are also disclosed. These bars are spaced from the ends of row and/or above and below the top and bottom lines. The individual bars may be joined together with linking sections. The spacing form the optotypes is preferably one half the width or height of the optotypes and their breadth is preferably that of the strokes of the optotypes.