Background: Sleep apnea, particularly obstructive sleep apnea (OSA), has been increasingly recognized as a significant risk factor for glaucoma. The present study was conducted to assess sleep apnoea as a risk factor in the development of open angle glaucoma. Materials & Methods: 48 cases of POAG and NTG of both genders were selected. Group I comprised of POAG, group II had NTG and group III had control. The Epworth Sleepiness Scale was used to measure excessive daytime sleepiness, and a score of more than 10 was deemed severe. The severity of the sleep apnoea was graded according to the Apnea Hypopnea Index (AHI) scale. Results: Group I had 14 males and 10 females, group II had 9 males and 15 females and group III had 12 males and 12 females. Severity of sleep apnoea was mild in 13 I group I, 10 in group II and 24 in group III, moderate in 11 in group I, and 14 in group II. The difference was significant (P< 0.05). Conclusion: Obstructive sleep apnea is a significant risk factor for glaucoma due to its effects on oxygenation, vascular regulation, and systemic inflammation.