board for testing of visual acuity and / or sensitivity to raumkontraste in humans, facility and process for their manufacture

摘要

PCT No. PCT/FR92/00739 Sec. 371 Date Jan. 18, 1994 Sec. 102(e) Date Jan. 18, 1994 PCT Filed Jul. 24, 1992 PCT Pub. No. WO93/02614 PCT Pub. Date Feb. 18, 1993.Equipment for testing visual acuity and/or visual sensitivity to spatial contrasts in humans comprises a sheet having a plurality of optotypes disposed on one of its faces, the optotypes being distributed in rows L1 . . . LN and columns C1 . . . CN. The optotypes having the same spatial frequency are arranged in the same row L1 . . . LN, the spatial frequency increasing from the first row L1 to the last row L1, the spatial frequency corresponding with the spatial frequency used for acuity tests. The optotypes constituting contrast isosensitivity sets are arranged in columns C1 . . . CN, and the luminance contrast of which has values decreasing from a first column C1, with a maximum contrast value, to a last column CN, with a minimum contrast value. N is an integer.