Table 1. The post-sleep visual function and ocular fatigue without illumination and at 5 or 10 lux of illumination.
| Parameters | No illumination | 5 or 10 lux illumination | P value | ||||
|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | ||||
| Objective parameters | |||||||
| Best corrected visual acuity | 1.00 | 0.00 | 1.00 | 0.00 | 1.000 | ||
| Refractory errors, diopter | −3.07 | 2.56 | −3.07 | 2.60 | 0.904 | ||
| Conjunctival hyperemia | |||||||
| Nasal | 16.85 | 8.43 | 20.93 | 9.57 | < 0.001 | ||
| Temporal | 17.96 | 8.33 | 20.93 | 9.96 | 0.021 | ||
| TBUT | 4.22 | 1.78 | 3.82 | 1.77 | 0.015 | ||
| Maximal blinking interval | 12.74 | 9.85 | 10.77 | 6.09 | 0.010 | ||
| Ocular surface temperature | 34.59 | 0.82 | 34.52 | 0.90 | 0.259 | ||
| Subjective parameters | |||||||
| Tired eyes | 1.61 | 1.42 | 2.17 | 1.38 | 0.004 | ||
| Sore/aching eyes | 0.50 | 0.84 | 0.78 | 1.00 | 0.024 | ||
| Irritated eyes | 0.98 | 1.39 | 1.24 | 1.48 | 0.142 | ||
| Watery eyes | 1.15 | 1.43 | 1.15 | 1.28 | 0.975 | ||
| Dry eyes | 1.69 | 1.72 | 1.80 | 1.45 | 0.744 | ||
| Eyestrain | 0.43 | 0.84 | 0.48 | 0.84 | 0.399 | ||
| Hot/burning eyes | 0.28 | 0.81 | 0.33 | 0.75 | 0.430 | ||
| Blurred vision | 0.56 | 1.04 | 0.50 | 1.00 | 0.729 | ||
| Difficulty focusing | 0.28 | 0.74 | 0.50 | 0.77 | 0.056 | ||
| Vision discomfort | 0.35 | 0.78 | 0.46 | 0.77 | 0.090 | ||
SD = standard deviation, TBUT = tear break-up time.