An involuntary, constant, rhythmic movement of the eyeball is called:
A) strabismus.
B) trichiasis.
C) retinitis pigmentosa.
D) nystagmus.
D
Explanation: A) Strabismus is a disorder in which the person squints.
B) Trichiasis is in-growing eyelashes.
C) Retinitis pigmentosa is degeneration of the retina.
D) Correct.
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