Fig. 2From: Obstructive sleep apnea as a risk factor for primary open angle glaucoma and ocular hypertension in a monocentric pilot studyDistribution of the apnea hypopnea index in different glaucoma groups; females in black, males in grey. OSA severity was classified as mild (AHI 5–15/h), moderate (AHI ≥15–30/h), severe (AHI ≥ 30/h) and non-OSA (AHI ≤ 5 /h). POAG = primary open angle glaucoma, LTG = low-tension glaucoma, OH = ocular hypertensionBack to article page