Which eyelid condition is defined as inward turning of the rim of the eyelid?

• A. Ectropion
• B. Ptosis
• C. Blepharitis
• D. Entropion

Answer: (D)

Entropion is the inward turning of the eyelid rim. When the lid margin turns toward the eye, the eyelashes and lash edges rub against the cornea and conjunctiva, causing irritation, a gritty sensation, tearing, and potential corneal injury if not treated. This contrasts with ectropion, which is an outward turning of the lid margin; ptosis, which is drooping of the eyelid rather than its inward turn; and blepharitis, which is inflammation of the eyelid margins. Entropion often results from aging and weakening of the eyelid tissues or from scarring, and treatment ranges from lubricating eye drops for milder cases to surgical procedures that tighten or reposition the lid for more significant symptoms.