Fig. 1
From: Color vision and luminance discrimination throughout the life span
Stimuli utilized in each experimental protocol: (A) protan, (B) deutan, (C) tritan, and (D) no-noise protocol. The luminance contrast of the stimuli was represented by a C-shaped target, with chromatic noise applied in protocols (A), (B), and (C) to mask the luminance contrast. In protocol (D), chromatic noise was absent.
