Table 4 Change of accommodative response after use of smart devices by spherical equivalent
Difference (Pre–Post) | P valuea | ||
|---|---|---|---|
Post smartphone use | Post tablet use | ||
Group 1: Hypermetropia or emmetropia (SE > -0.5 Diopter) | |||
NPA (cm) | -0.33 ± 0.71 | -0.22 ± 0.44 | 0.317 |
NPC (cm) | -0.78 ± 0.97 | -0.22 ± 0.44 | 0.059 |
Refractive response (D) | |||
At 1 m | 0.54 ± 1.32 | 0.33 ± 1.40 | 0.341 |
At 67 cm | 0.39 ± 1.20 | 0.21 ± 1.31 | 0.263 |
At 33 cm | 0.23 ± 0.95 | 0.10 ± 0.94 | 0.192 |
Accommodative facility (D) | 0.31 ± 0.47 | 0.24 ± 0.65 | 0.767 |
Group 2: Myopia (SE ≤ -0.5 Diopter) | |||
NPA (cm) | -0.16 ± 0.50 | -0.08 ± 0.28 | 0.083 |
NPC (cm) | -0.11 ± 0.39 | -0.05 ± 0.23 | 0.324 |
Refractive response (D) | |||
At 1 m | 0.06 ± 0.24 | 0.06 ± 0.25 | 0.942 |
At 67 cm | -0.01 ± 0.26 | -0.13 ± 0.31 | 0.006 |
At 33 cm | 0.12 ± 0.61 | -0.02 ± 0.54 | 0.618 |
Accommodative facility (D) | 0.04 ± 0.56 | 0.08 ± 0.54 | 0.560 |