AIM:To compare the difference of accommodation response under the variety reading conditions including computer screen, mobile phone screen and printed texts. The investigation also included the accommodation response under these conditions with different distances, brightness, dynamic and static testing status.

METHODS:Thirty volunteer subjects were included with normal vision function. The reading target on computer screen, mobile screen and paper were used, respectively. Grand Seiko WAM 5500 infrared automatic refractometer was applied to measure accommodation response. The influence of different reading conditions on accommodation was compared using variance analysis with SPSS17.0.

RESULTS:Accommodation lag under the computer screen with high brightness was 0.52±0.24D, that under papers was 0.73±0.28D, that under mobile phone was 0.72±0.29D. Accommodation lag under the computer screen with high brightness was less than that under mobile phones and paper, the differences were statistically significant(P<0.05). The accommodation lag under mobile phones and paper had no statistical difference. Accommodation microfluctuations and pupil size under the mobile phone was slightly largerer than the accommodation lags under the other conditions, but the difference was not statistically significant.

CONCLUSION:Accommodation lag under the computer screen with high brightness is relatively smaller than that under mobile phone or paper. There is no significant difference between those under phones and paper. With the brightness of computers in a certain range, there is no effect for accommodation response.