The Effect Of Peripheral Vision On Myopia Progression

Objective To determine whether peripheral vision has influence on accommodative adaptation and nearwork induced transient myopia(NITM)and whether the influence is different between emmetropes and progressing myopes.Methods 30 subjects were enrolled.The NITM and its decay were objectively measured with a Canon R-1 infrared optometer after a 20-min near task both in large and small field conditions. Another 18 subjects were enrolled.The accommodative adaptation were objectively measured with a Canon R-1 infrared optometer after a 20 min near task both in large and small field conditions.Results There is significant near-work after-effect in PMs(0.31D in large field;0.29D in small field)in comparison to EMMs(0.15D in large field;0.15D in small field)and SMs(0.19D in large field;0.20D in small field). Significant longer time constants were also found in SMs and PMs.However,there is no significant different between large and small reading conditions.The accommodative adaptation were(0.55±0.37)D and(0.54±0.49)D in emmetropes and progressing myopes,were(0.50±0.11)D both in large and small reading conditions.However,there was no difference between large and small viewing conditions during the near-work task.In addition,the accommodative adaptation in the progressing myopes was not significantly different from that in the emmetropes. Conclusion The peripheral vision may have no significant contribution to accommodative adaptation and NITM and its decay,which is thought as one possible mechanism for the development of myopia.