Purpose: To conduct an experimental investigation of the effect of accommodati ve relaxation using far point shift stimuli for the reduction of asthenopia. Met hods: Twenty-two female students accommodated to a far point shift stimuli duri ng a 2-min period immediately after a 15-min sustained task on a three-dimen -sional display. Before and after the trial, their accommodative step response and symptoms were assessed. The far point shift stimuli in the optical system, w hich were presented on a refractometer, were created by moving the target scener y images from far to near, lineally centred about the far point position of each eye. During 2 min of fixating on the far point shift stimuli, changes in refrac tion were recorded in the same eye. Re sults: While looking at the far point shift stimuli, 10 of 22 subjects had cha nges in refraction that showed a hypermetropic shift, and the other 12 subjects had changes in refraction that showed a myopic shift. The time taken for the acc ommodative step response from far to near post-trial in the myopic shift group was markedly prolonged, and the accommodative lag at the far target in the optom eter was significantly increased. In the myopic shift group, the symptoms of ’e ye fatigue’, ’eye pain’, ’eye heaviness’, and ’eye dryness’also increased after the trial. In the hyperopic shift group, however, only the symptom of ’e ye dryness’increased, with no reduction of accommodation function. Conclusions: We suggest that accommodative relaxation by accommodative far point shift stimu li is effective in the reduction of asthenopia. Purpose: To conduct an experimental investigation of the effect of accommodati ve relaxation using far point shift stimuli for the reduction of asthenopia. Met hods: Twenty-two female students accommodated to a far point shift stimuli duri ng a 2-min period immediately after a The far point shift stimuli in the optical system, w hich were presented on a refractometer, were created by moving the target scener y images from far to near, lineally centred about the far point position of each eye. During 2 min of fixating on the far point shift stimuli, changes in refrac tion were recorded in the same eye. Re sults: While looking at the far point shift stimuli, 10 of 22 subjects had cha nges in refraction that showed a hypermetropic shift, and the other 12 subjects had changes in refraction that showed a myopic shift. The time taken for the acc om modative step response from far to near post-trial in the myopic shift group was markedly prolonged, and the accommodative lag at the far target in the optomter was significantly increased. In the myopic shift group, the symptoms of ’e ye fatigue’ ’the eye pain’, ’eye heaviness’, and’ eye dryness’ increased after the trial. In the hyperopic shift group, however, only the symptom of ’e ye dryness’increased, with no reduction of accommodation function. Conclusions: We suggest that accommodative relaxation by accommodative far point shift stimu li is effective in the reduction of asthenopia.