Ptosis (pronounced “toh-sis”) means drooping of the eyelid, and it can affect one or both eyes. When the eyelid droops, it may block part of the upper field of vision. Patients may complain of difficulty keeping the eyes(s) open, eyestrain, eyebrow ache and fatigue, especially when reading. Some patients find they tilt their head back or hold up a lid in order to see better.
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