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A redundant folds in the conjunctiva typically located between the globe and the lower eyelid. Loose bulbar conjunctiva that may become pinched between the lids and cause tearing and inflammation. Frequently age-related. Usually found along the lower lid margin. It interferes with the normal distribution of tears causing dry eye and epiphora.

Small soft or rigid lenses floated on the tear film over the cornea to correct eyesight.

Reflex that enables the eyes to focus on a single point in near vision.