<prompt> Phenomenon in which all colors are seen as grey due to decreased sensitivity of cones is calledStile Crawford effectPurkinje shiftDark adaptationColor blindness  <response>: 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. 