CPAP CAN INCREASE IOP

Continuous Positive Airway Pressure Therapy Is Associated with an Increase in Intraocular Pressure in Obstructive Sleep Apnea -- Kiekens et al. 49 (3): 934 -- Investigative Ophthalmology & Visual Science

According to this study:

"Patients with obstructive sleep apnea demonstrated significant 24-hour IOP fluctuations (3 mmHg more), with the highest values at night. CPAP therapy causes an additional IOP increase, especially at night. Regular screening of visual fields and the optic disc is warranted for all patients with OSA, especially those treated with CPAP.