Under Certain Conditions, Visual Stimuli, Even in Bright Light, Can

Multiple Choice

Under certain conditions, visual stimuli, even in bright light, can seem to disappear from our perception. What is one potential cause of this phenomenon in healthy human eyes?

A) Light can be completely blocked from reaching the retina if pupils constrict too far.
B) Corneas may reflect only part of an image to the retina.
C) There are no photoreceptors at the location where optic nerve fibers leave the eye, which causes a blind spot.
D) In certain parts of the retina, photoreceptors may "cancel" each other out so no signals are sent.
E) This phenomenon is a product of higher-order perception and does not involve the retina.