Therapeutic effect of visual training on low vision of no amblyopia

Objective To investigate the therapeutic effect of visual training on low vision of no amblyopia. Methods A prospective study. A total of 56 children with low vision of no amblyopia were selected which came to Puyang Eye Hospital during a period from February 2015 to May 2016 to accept an visual training lasted for 4 weeks. All of the children met the following criteria: the degree of refractive power was-1.00 D~+3.00 D, without anisometropia, the discrepancy of corrected visual acuity of two eyes was less than two rows on standard visual acuity chart, the corrected visual acuity was below normal children, aged from 5 to 12 years old. The monocular corrected visual acuity, uncorrected visual acuity, monocular Flipper cycle and amplitude of monocular accommodation before and after the visual training were measured. Results The average binocular uncorrected visual acuity of the 56 children was 0.53±0.13 before training and was 0.91±0.14 after training, with statistical difference (t=3.2657, P <0.05). The average binocular corrected visual acuity was 0.59±0.12 before training and was 0.98±0.05 after training, with statistical difference (t=3.3724, P <0.05). The Flipper cycle of right eye before and after training respectively was 5.8±2.6 and 18.2±1.7, with statistical difference (t=13.6285, P <0.05). The Flipper cycle of left eye before and after training respectively was 6.3±1.9 and 18.5±1.3, with statistical difference (t=12.8354, P <0.05). The amplitude of accommodation of right eye was 8.9±2.5 D before training and was 15.1±1.2 D after training, with statistical difference (t=20.1624, P <0.05). The amplitude of accommodation of left eye was 8.6±2.2 D before training and was 15.3±1.1 D after training, with statistical difference (t=21.6218, P <0.05). Conclusions Visual training can effectively improve the adjust sensitivity and the amplitude of accommodation, uncorrected visual acuity and corrected visual acuity of low vision of no amblyopia. This suggests that the low vision of these patients is caused by dysfunction of accommodation. Key words: Visual training; Low vision; Amplitude of accommodation; Adjust sensitivity