What condition is characterized by the drooping of the eyelids?

Ptosis is the condition characterized by the drooping of the eyelids. This condition can occur due to various reasons, including muscle weakness, paralysis of the nerves that control eyelid movement, or other underlying health issues. The primary feature of ptosis is that it results in the eyelid hanging lower than normal, which can impact vision and often requires medical or surgical intervention to correct, especially if it obstructs the line of sight.

In contrast, the other terms refer to different eyelid or eyelash-related conditions. Entropion involves the inward rolling of the eyelid, which can lead to irritation of the eyeball. Trichiasis refers to misdirected eyelashes that can rub against the cornea, causing discomfort and potential damage. Tarsorrhaphy is a surgical procedure that involves suturing the eyelids partially or completely shut to protect the eye, often used in cases of severe ocular surface disease. Understanding these distinctions emphasizes why ptosis specifically pertains to eyelid drooping, while the other terms reference different eyelid problems.