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Ophthalmic Technician

Category - Pupillary Assessment

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Relative afferent pupillary defect (RAPD) is an indicator of damage to which structure in the eye?

Lens
Cornea
Optic nerve
Iris

Explanation

Answer: C - RAPD is an indicator of damage to the optic nerve. Optic nerve fibers carry the afferent fibers of the pupillary reflex to the brain. When light is thrown on the eye, the signals are carried by the optic nerve to the brain. Hence, damage to the optic nerve results in RAPD. When light is thrown on the affected eye, the brain fails to receive signals and the pupil fails to constrict.

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