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The pupil of one eye is larger than the other and this condition is observed in a disorder named as Anisocoria. The quantity of light that enters the eye is controlled by the pupil. The pupil narrows down in bright light and dilates in low light. The muscles in the Iris region show some problem in getting dilated and hence lead to Anisocoria.
Quick Answer. Pinpoint pupils, or abnormal miosis, occur as the result of stimulation to the parasympathetic side of the autonomous nervous system. According to WebMD, drug use, exposure to organophosphates and intracranial hemorrhaging all cause both pupils to shrink.