The effect of increasing the illumination on operators’ visual performance in the control-room of a combined cycle power plant

Table 2 The values of visual performance indicator of Acuity C Test (Ŋ- accuracy C) and visual acuity before and after the intervention

Time		Before intervention (Median ± IQR)	After intervention (Median ± IQR)	p-value^*
Parameters		Before intervention (Median ± IQR)	After intervention (Median ± IQR)	p-value^*
9:00 N = 16	Ŋ	0.33 ± 0.09	0.5 ± 0.12	< 0.001
9:00 N = 16	Visual acuracy (\( \frac{1}{Arcmin} \))	1.62 ± 0.34	1.84 ± 0.38	< 0.001
15:00 N = 16	Ŋ	0.22 ± 0.12	0.32 ± 0.11	< 0.001
15:00 N = 16	Visual acuracy (\( \frac{1}{Arcmin} \))	1.31 ± 0.56	1.52 ± 0.66	< 0.001
21:00 N = 16	Ŋ	0.33 ± 0.12	0.59 ± 0.1	< 0.001
21:00 N = 16	Visual acuracy (\( \frac{1}{Arcmin} \))	1.20 ± 0.41	1.51 ± 0.31	< 0.001
3:00 N = 16	Ŋ	0.25 ± 0.13	0.34 ± 0.13	< 0.001
3:00 N = 16	Visual acuracy (\( \frac{1}{Arcmin} \))	1.02 ± 0.24	1.23 ± 0.23	< 0.001