2017 Volume 38 Issue 4 Pages 114-121
Measurements to quantify eye fatigue with both-eye open conditi on are not well investigated, Eighteen subjects were instructed to play a commercial 3D game with a portable ga me console for 30 minutes as visual load and changes of accommodation and vergence responses between pre-load and po st-load were examined by a custom-built binocular wavefront sensor. In our measurements, a fixation target were driven reciprocally with constant-diopter (＋/－0.25D/sec.) or with a stepwis e (2.0/0.2D) stimuli. The late ncies of convergence and divergence after visual-load were significantly prolonged (P＜0.05) in the stimuli for reciprocal movements. Similarly, it was found in stepwise stimulus the time required to change the accommodation from 80％ to 10％ i n relaxation phase became longer (P＜0.05) in post-load measurement. Our results suggest the accommodation an d vergence responses measured by a binocular wavefront sensor can be applied to objective evaluation of eye fatigue. Particularly, the convergence, which is less affected by age, is promising for application to the over middle-aged people.
