A-A-53032 1987 Edition, June 29, 1987
SCREEN, TANGENT, EYE EXAMINING
Includes all amendments and changes through Cancellation Notice 1, September 11, 2012
Additional Comments: CNCL NO S/S
The General Services Administration has authorized the use of this commercial item description.
This commercial item description covers two types of tangent screens of the Bjerrum design used for diagnosing pathological conditions of the living human eye by providing an accurate method of charting the central and paracentral fields of vision at one and two meter test distances.
Type I: Roller type Type II: Folding type