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Apraclonidine Testing for Horner Syndrome.
Notes: (A) Left Horner syndrome in a 25-year-old man. Note left ptosis and anisocoria with the smaller pupil on the left. Both pupils reacted briskly to light stimulation. (B) Forty-five minutes after topical instillation of 1% apraclonidine in both eyes, there is reversal of anisocoria, with the right pupil now smaller than the left. Note also improvement in the left-sided ptosis.
