Demographic and polysomnographic variables in all subjects.

<p>All values are presented as means ± S.E.M.</p

Results of eye chart visual acuity test for the without-CPAP group (A) and with-CPAP group (B) are presented in bar graph.

<p>There is no significant difference between groups. Error bars  =  S.E.M.</p

Pre and post sleep comparison of left and right corneal thickness of each group.

<p>Values are given as microns for corneal thickness (means ± S.E.M.).</p>*<p>p = 0.0025 very significant (t = 4.134 with 9 degrees of freedom). The comparison is between Pre-Sleep and Post-Sleep of left corneal thickness in without-CPAP group.</p>**<p>p< 0.0001 extremely significant (t = 9.257 with 9 degrees of freedom). The comparison is between Pre-Sleep and Post-Sleep of right corneal thickness in without-CPAP group.</p

Results of post-sleep questionnaire of “with-CPAP” (CPAP) and “without-CPAP” (wo/CPAP) groups.

<p>The questionnaire is made-up of four categories, which are Blurred Vision (BV) – panel A, Dimmer Vision (DV) – panel B, Clear Vision (CV) – panel C and Eye Discomfort (ED) –panel D. Statistically significant (i.e., accepted as p<0.05) p values are shown in the figure. Non-significant p values are not shown. The possible three answers to each of the categories are summarized as “Less answer” =  “Less”, “Same answer”  =  “SameMore” and “More answer”  =  “SameMore” to make an easy interpretation of data.</p

Visual acuity values of each patient.

<p>Values are given as Snellen units.</p