Table 10.
Data summary of the mfERG subgroup.
| Parameters | mfERG students from control group (n = 20 eyes of 20 students) (Mean ± SD) Median (range) |
mfERG of students from CVS group (n = 20 eyes of 20 students) (Mean ± SD) Median (range) |
Mean difference (mini−control−risk) 95% confidence of interval | P value |
|---|---|---|---|---|
| Age | 22.35 ± 1.53 | 21.95 ± 2.14 | 0.4 | 0.50 |
| 22 (19 : 25) | 21 (19 : 25) | (−0.79 : 1.59) | ||
| Gender: | ||||
| Male | 8 (40%) | 8 (40%) | 1.00 | |
| Female | 12 (60%) | 12 (60%) | ||
| Screen-hours: | ||||
| 1 h | 4 (20%) | 0 | ||
| 2 h | 3 (15%) | 1 (5%) | 0.09 | |
| 3 h | 3 (15%) | 1 (5%) | ||
| 4 h | 2 (10%) | 4 (20%) | ||
| 5 h | 5 (25%) | 5 (25%) | ||
| ≥6 h | 3 (15%) | 9 (45%) | ||
| - mfERG students < 3 screen-hours | 10 (50%) | 2 (10%) | 0.006 | |
| - mfERG students ≥3 screen-hours | 10 (50%) | 18 (90%) | ||
| Screen-time: | ||||
| Day | 12 (60%) | 5 (25%) | 0.03 | |
| Night | 8 (40%) | 15 (75%) | ||
| Screen-illumination: | ||||
| 10% | 5 (25%) | 1 (5%) | 0.06 | |
| 30% | 7 (35%) | 3 (15%) | ||
| 50% | 5 (25%) | 5 (25%) | ||
| 80% | 2 (10%) | 6 (30%) | ||
| 100% | 1 (5%) | 5 (25%) | ||
| - mfERG students ≤50% illumination | 17 (85%) | 9 (45%) | 0.01 | |
| - mfERG students >50% illumination | 3 (15%) | 11 (55%) | ||
| Commonest screen used: | ||||
| Desktop computers | 0 | 2 (10%) | 0.4 | |
| Laptops | 1 (5%) | 2 (10%) | ||
| Apple | 4 (20%) | 4 (20%) | ||
| Android | 14 (70%) | 12 (60%) | ||
| Other screens | 1 (5%) | 0 | ||
| mfERG findings: | ||||
| I-amplitudes P1 (nV/deg2): | ||||
| Ring 1 (normal 66.6–130.8) | 80.60 ± 19.71 | 54.01 ± 9.17 | 26.59 (16.75 : 36.43) | <0.0001 |
| 76.49 (45.26 : 141.4) | 52.86 (40.43 : 74.09) | |||
| Ring 2 (normal 30.9–77.8) | 35.75 ± 6.94 | 30.55 ± 5.97 | 5.20 (1.05 : 9.34) | 0.02 |
| 34.76 (25.08 : 52.74) | 30.97 (15.17 : 40.61) | |||
| Ring 3 (normal 21.7–59) | 19.80 ± 3.80 | 18.57 ± 3.67 | 1.22 (−1.17 : 3.62) | 0.31 |
| 20.08 (13.38 : 25.3) | 18.27 (11.54 : 25.36) | |||
| Ring 4 (normal 12.9–37.1) | 12.62 ± 2.52 | 10.50 ± 2.40 | 2.11 (0.54 : 3.69) | 0.01 |
| 12.87 (8.87 : 17.38) | 10.21 (4.98 : 14.37) | |||
| Ring 5 (normal 10–28.2) | 9.69 ± 2.55 | 7.82 ± 1.81 | 1.88 (0.46 : 3.29) | 0.01 |
| 9.13 (5.51 : 14.51) | 7.74 (4.57 : 10.93) | |||
| II-amplitudes P1 (nV/deg2): | ||||
| Quadrant 1 (normal 15.8–42.74) | 11.26 ± 3.76 | 9.17 ± 2.01 | 2.09 (0.16 : 4.03) | 0.03 |
| 10.83 (5.05 : 19.41) | 9.29 (5.12 : 12.48) | |||
| Quadrant 2 (normal 15.98–42.75) | 14.39 ± 2.81 | 12.03 ± 2.98 | 2.36 (0.51 : 4.22) | 0.01 |
| 13.91 (9.58 : 18.71) | 12.09 (5.63 : 17.54) | |||
| Quadrant 3 (normal 15.18–42.05) | 15.13 ± 3.06 | 12.80 ± 3.46 | 2.33 (0.24 : 4.42) | 0.03 |
| 13.69 (10.6 : 21.02) | 12.60 (5.23 : 18.4) | |||
| Quadrant 4 (normal 13.87–39.61) | 10.27 ± 2.41 | 9.20 ± 2.18 | 1.07 (−0.40 : 2.54) | 0.15 |
| 9.98 (6.62 : 16.02) | 8.49 (6.09 : 16.02) | |||
| III-foveal functions: | ||||
| Normal foveal response (21 eyes) | 20 eyes (100%) | 3 eyes (15%) | <0.0001 | |
| Reduced foveal response (19 eyes) | 0 (0%) | 17 eyes (85%) |