A condition where the eyelid skin becomes loose, redundant, and droops, often due to aging, allergies, or repeated rubbing of the eyes.
From Greek 'blepharon' (eyelid) + 'chalasis' (relaxation or loosening). The term entered medical use in the late 19th century to describe the progressive loss of elasticity in eyelid skin.
Chronic eye rubbing — whether from allergies or habit — can actually break down the elastic fibers in your eyelids permanently, and this is why ophthalmologists are so intense about telling people to stop rubbing their eyes; the repeated stress literally stretches the skin like a rubber band that won't snap back.
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