Table 2. Visual function and ocular fatigue of subjects exposed to 5 lux illumination during the 3rd night.
| Parameters | No illumination | 5 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 | −2.82 | 2.66 | −2.79 | 2.76 | 0.279 | ||
| Conjunctival hyperemia | |||||||
| Nasal | 16.54 | 7.45 | 20.77 | 7.96 | 0.008 | ||
| Temporal | 17.69 | 7.65 | 20.00 | 8.49 | 0.238 | ||
| TBUT | 4.50 | 1.61 | 4.15 | 1.71 | 0.131 | ||
| Maximal blinking interval | 14.90 | 13.15 | 12.29 | 7.85 | 0.091 | ||
| Ocular surface temperature | 34.64 | 0.78 | 34.58 | 0.90 | 0.777 | ||
| Subjective parameters | |||||||
| Tired eyes | 1.65 | 1.38 | 2.12 | 1.42 | 0.126 | ||
| Sore/aching eyes | 0.65 | 0.98 | 0.88 | 1.11 | 0.256 | ||
| Irritated eyes | 1.12 | 1.53 | 1.46 | 1.50 | 0.124 | ||
| Watery eyes | 1.31 | 1.52 | 1.27 | 1.19 | 0.964 | ||
| Dry eyes | 1.62 | 1.50 | 1.85 | 1.46 | 0.430 | ||
| Eyestrain | 0.58 | 0.99 | 0.54 | 0.81 | 0.874 | ||
| Hot/burning eyes | 0.31 | 0.97 | 0.46 | 0.95 | 0.157 | ||
| Blurred vision | 0.73 | 1.19 | 0.54 | 0.99 | 0.344 | ||
| Difficulty focusing | 0.50 | 0.99 | 0.62 | 0.80 | 0.564 | ||
| Vision discomfort | 0.65 | 1.02 | 0.62 | 0.94 | 1.000 | ||
SD = standard deviation, TBUT = tear break-up time.