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Third Eyelid Prolapse
Elevation or protrusion of the nictitating membrane across the inner corner of the eye.
Key Facts
- It occurs when sympathetic tone to the smooth muscle of the third eyelid is lost.
- The membrane appears more prominent and covers part of the cornea.
- It is a consistent clinical feature of Horner's syndrome in companion animals.
- It results from unopposed parasympathetic contraction of the retractor bulbi muscle.