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Apraclonidine eyedrop test in a child with suspected right Horner syndrome. A, Pretesting with apraclonidine eyedrops. The right pupil is smaller in diameter compared with the left, which was more evident in dim light; there is mild right upper lid ptosis. B, Reversal of anisocoria after apraclonidine eye drops, with the right pupil now larger than the left and reversal of right upper lid ptosis.
