The pupil is a hole in the iris that controls the amount of light entering the eye. The pupillary light reflex controls the diameter of the pupil in response to light intensity to help the eye adapt to different light levels. An amaurotic pupillary defect occurs when an eye cannot see light at all due to severe retinal or optic nerve disease. In an amaurotic pupil, the pupils are equal in size and neither pupil reacts when light is shone in the defective eye, but both pupils react when light is shone in the good eye.

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Pupillary Disorder
Amaurotic Pupil

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Pupil
 The pupil is a hole located in the center of the iris of the eye
that allows light to enter the retina.

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Pupillary light reflex
is a reflex that controls the diameter of
the pupil, in response to the intensity
(luminance) of light that falls on the
retina of the eye, thereby assisting in
adaptation to various levels of darkness
and light, in addition to retinal
sensitivity.

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Amaurotic pupillary defect
is the term applied to an
eye that does not even see
light owing to severe
unilateral retinal or optic
nerve disease.

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Amaurotic pupillary defect
Amaurotic pupillary response.

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Abnormal Pupils:
 Amaurotic, "blind eye," with no light perception as a result of an
optic nerve lesion.
 A.) Pupils are of equal size.
 B.) Neither pupil reacts when the defective eye is stimulated.
 1.) There is no direct light response.
 2.) There is no consensual light response to the contralateral
eye.
 C.) Both pupils react when the contralateral eye is stimulated.
 1.) Direct light response is present.
 2.) Consensual light response is present.
 D.) Near reflex is normal.