What typically causes spastic entropion?

Spastic entropion is primarily caused by involuntary movements of the eyelids, which often result from irritation or inflammation of the ocular surface. This condition leads to a tightening of the muscles around the eye, causing the eyelids to turn inward toward the eyeball. Infection and environmental irritation, such as from conjunctivitis or exposure to wind and dust, can create a spastic response in the eyelid muscles, resulting in this condition.

While genetic anomalies, excessive UV light exposure, and age-related changes can contribute to various eye conditions and eyelid malpositions, they do not specifically lead to the spastic form of entropion. Genetic anomalies typically affect structural aspects of the eyelid but do not necessarily cause the muscle spasms seen in spastic entropion. UV exposure and age-related skin changes can lead to other forms of eyelid dysfunction or cosmetic changes, but they do not directly cause the muscle contractions that define spastic entropion.