Stopped: incomplete enrollment
This study is evaluating the pupil dilation of Horner's Patients who have ever taken an alpha blocker such as Tamsulosin. Patients will undergo eye dilation as would occur at a yearly eye examination, but their pupil dilation measurements will be recorded.
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Pupil Size Measurements
Timeframe: 20-30 minutes after 10% phenylephrine has been placed in each eye.