Eye Accommodation Evoked by Line of Gaze

Abstract

In this paper, slight near accommodation associated with vertical eye movement is measured dynamically for the first time with the aid of a newly developed three-dimensional optometer III. The amount of accommodation decreases when the target position is moved towards the subject. The results agree with P. H. Ripple's results (1952) on the accommodation induced at far points, but contradict with the accommodation evoked at near points. The results also differ on the accommodation evoked by horizontal eye movement. A plausible explanation is presented by comparing the response of the pupil diameter with the accommodation response.