Abstract
The resting position of accommodation is determined by the equilibrium established between sympathetic and parasympathetic tone. To accommodate for near objects is brought about by excitation of the parasympathetic, and distant objects call for excitation of the sympathetic system. To investigate accommodation and pupil after-effects following the ten minutes visual task with stereoscopic three dimensional images, the measurements of the dynamic responses of accommodation and pupil were made. When the subjects worked at 0.4m (closer than their resting state) and at 1m corresponded to their resting positions, the response delay in accommodative relaxation occurred in each condition. When they worked at outside their resting position (3m viewing distance), the significant response delay in contraction and the increases of accommodative error and the area of miosis were shown. There was data that the after-effect on accommodation and pupilary function was different between in the case of tasks given inside and outside their resting positions.
