Entropion causes patients to feel eye irritation. They will think something is in their eye like an eyelash. As patients blink, the lower eyelid curls in causing the skin to scratch the eye. The eye itself is typically red and irritated.
The entropion results from improper balance of the forces between the retractors of the lower lid which pull the eyelid downward, the overriding orbicularis which pushes the eyelid inward, and the lateral canthal tendon which pulls the eyelid to the side.
If there is too much force provided from the overriding orbicularis the eyelid tends to turn in if the lateral canthal tendon is lax.
Correction of entropion can be achieved by correcting these abnormalities.