What term describes incomplete eyelid closure?

The term that describes incomplete eyelid closure is lagophthalmos. This condition occurs when the eyelids do not fully meet when closed, leaving part of the eye exposed. This inadequate closure can lead to exposure keratitis or corneal damage, as the tear film cannot properly cover and protect the surface of the eye.

In contrast, other terms relate to different ocular conditions: entropion refers to eyelids that roll inward toward the eye, which can cause irritation and corneal damage due to eyelashes rubbing against the cornea. Ectropion describes eyelids that turn outward, which can also expose the inner eyelid surface and lead to drying and irritation. Blepharospasm is characterized by involuntary spasms of the eyelid muscles, resulting in frequent blinking or closure of the eyelids but does not imply incomplete closure like lagophthalmos does. Understanding these distinctions is important for diagnosing and managing various eyelid abnormalities effectively.