What is the normal vertical dimension of the palpebral fissure in adults?

The normal vertical dimension of the palpebral fissure in adults is typically around 10 mm. This measurement refers to the distance between the upper and lower eyelids when the eyes are in a neutral position and is important in both aesthetics and function. A palpebral fissure of this size allows for adequate exposure of the cornea and is essential for proper tear film distribution, which is vital for ocular health.

In practice, variations can occur based on individual anatomical differences, ethnic backgrounds, and age, but 10 mm is commonly cited as the standard measurement encountered in clinical settings. This standard provides a reference point for assessing conditions such as ptosis (drooping eyelids), where the vertical dimension may be decreased, or conditions leading to increased exposure. Recognizing this normal value aids healthcare professionals in diagnosing and treating eyelid-related disorders effectively.