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Anisocoria with brisk constriction to light OD and imperceptible reaction to light OS (A), with OS constriction to near greater than OD (B). 0.125% pilocarpine test demonstrates 3.75 mm OD and 3.25 mm OS, confirming the diagnosis of a left tonic pupil (C). OD, oculus dexter; OS, oculus sinister.
