What is palpebral fissure?

The palpebral fissure is the opening between the upper and lower eyelids through which the eye is visible. It is commonly measured in medical examinations to assess conditions such as ptosis (drooping eyelids) or exophthalmos (bulging eyes). The width of the palpebral fissure can vary among individuals, with the average width being around 10-11 mm in adults. Abnormalities in the palpebral fissure can indicate underlying health issues or genetic conditions.