DYNAMIC VISUAL ACUITY TESTING APPARATUS

• US 3,807,839 A
• Filed: 01/28/1972
• Issued: 04/30/1974
• Est. Priority Date: 01/28/1972
• Status: Expired due to Term

• Current Assignee: Robert C. Sugarman, Sussman E. Donald
• Original Assignee: Robert C. Sugarman, Sussman E. Donald
• Inventors: Sugarman, Robert C., Sussman, E. Donald
• Primary Examiner(s): Sacher, Paul A.
• Application Number:
  US05/221,501
• Time in Patent Office: 823 Days
• Field of Search: 351/36,32,37
• US Class Current: 351/243
• CPC Class Codes: A61B 3/063 for testing light sensitivity, i.e. adaptation
• CPC Class Codes: A61B 5/18 for vehicle drivers or machine operators

Abstract

A dynamic visual acuity measuring apparatus having a rotating disc containing a plurality of transparent target-pairs, one target of each presenting a uniformly gray appearance and the other target of each presenting resolvable dark and light areas, and lamps or the like for individually providing backillumination for each target.

Claims

1. A dynamic visual acuity measuring apparatus, comprising;

A. a plurality of targets mounted for rotation about an axis corresponding to an observer'"'"''"'"'s line of sight, B. means For rotating said targets at a known constant angular velocity, and C. illumination means for selectively lighting at least one of said targets as it rotates, D. wherein said targets comprise a plurality of variably sized first patterns, E. said targets further comprise a plurality of variably sized unresolvable patterns, and wherein F. said targets are arranged in pairs, each pair containing one of said first and one of said unresolvable patterns.

2. The apparatus according to claim 1, wherein;

G. said first patterns comprise a plurality of spaced annular light and dark areas.

3. The apparatus according to claim 2, wherein;

H. said unresolvable target comprises a plurality of closely spaced annular light and dark areas, the total dark area of which is substantially equal to the total dark area of said first pattern.