[Static characteristics of accommodation on the relationship between accommodative resting position and viewing distance].

The steady-state accommodation of subjects during a 15 min visual task was measured in real time by an infrared optometer to investigate the relationship between accommodative resting position and the effect of viewing distance. When the subjects were loaded at 50 cm (closer than their resting state), the steady-state accommodation showed an inward shift which was enhanced when computation was done. On the contrary, when they worked outside their resting position-2m viewing distance-, an outward shift of steady-state accommodation was seen in the control group who reacted only to the visual objects displayed. For the mental task group this was not evident. It appears that the steady-state accommodation is different between the cases of visual stimuli given inside and outside the resting position.