Phenomenon in which all colors are seen as grey due to decreased sensitivity of cones is called: (A) Stile Crawford effect, (B) Purkinje shift, (C) Dark adaptation, (D) Color blindness
Answer is B. Phenomenon in which all colors are seen as grey due to decreased sensitivity of cones is called Purkinje shift. The Stiles-Crawford effect is the phenomenon where light entering the eye near the edge of the pupil produces a lower photoreceptor response compared to light of equal intensity entering near the center of the pupil.