Obstructive sleep apnea syndrome (OSAS), a common sleep-disordered breathing disorder, is characterized by repeated episodes of sleep apnea resulting from a variety of causes. OSAS patients have repeated upper airway collapse and obstruction and experience hypopnea and/or apnea during sleep, and all these can further lead to multisystem diseases. In recent years, much evidence has shown that multiple eye diseases are included in the complications of OSAS. The article reviewed the association between OSAS and eye diseases as follows.