Which condition is characterized by the inability to completely close the eyelids during sleep?

Lagophthalmos refers to the condition where an individual is unable to completely close their eyelids during sleep. This is significant because it can lead to dry eye issues and expose the cornea to elements, increasing the risk of damage and infection. Understanding this condition is critical in the field of eye care, particularly in contact lens fitting and management.

The inability to fully close the eyelids can occur due to a variety of factors including facial nerve paralysis, trauma, or anatomical irregularities. Patients might experience symptoms like discomfort, irritation, and dryness in the eyes, highlighting the importance of recognizing and addressing this condition.

The other conditions listed do not pertain to the inability to close the eyelids. Blepharoptosis involves drooping of the upper eyelid, which may not directly affect eyelid closure during sleep. Pterygium is a growth on the conjunctiva and does not impact eyelid closure. Entropion refers to the inward turning of the eyelid, which might cause irritation but does not relate to the ability to close the eyelids completely during sleep. Understanding these distinctions is valuable for recognizing ocular health issues.