The purpose of our study was to measure the change in blink rate and pupil diameter following a visual display terminal (VDT) task. Participating in our study were 11 subjects, all having a visual acuity of 1.0 and normal ocular health. All were asked to play a game for 60 minutes on a personal computer as a VDT experiment. Results showed that, the anterior corneal higher-order aberrations exhibited no significant difference. However, results also showed that miosis is delayed by bright stimulation. The blink rate increased after the VDT experiment. The temporary change in pupil diameter due to blinking reduced after the experiment. Also, after the experiment, the time required for pupil diameter minimization was shorter than before the experiment. However, the pupillary function reduction caused by VDT use was improved by consecutive blinking. Our results therefore suggest that the visual function diminishment was compensated by blinking.