Table 4. Comparison of RNFL thickness between mild, moderate and severe OSAS groups.

RNFL thickness	Mild OSAS Group (n=13)	Moderate OSAS Group (n=17)	Severe OSAS Group (n=14)	1P
First measurement (µm)	101.9±9.1	105.3±7.8	100.8±9.1	0.215
Last measurement (µm)	99.6±9.2	99.1±7.7	92.6±8.0	0.034
Difference in first and last measurements (µm)	2.3±5.6	6.2±5.2	8.2±8.0	0.155

RNFL: Retinal nerve fiber layer; ¹Kruskal–Wallis analysis of variance test was used.