Effect of Weak Hyperopia on Stereoscopic Vision

Abstract

Convergence, accommodation and pupil diameter were measured simultaneously while subjects were watching 3D images. The subjects were middle-aged and had weak hyperopia. WAM-5500 and EMR-9 were combined to make an original apparatus for the measurements. It was confirmed that accommodation and pupil diameter changed synchronously with convergence. These findings suggest that with naked vision the pupil is constricted and the depth of field deepened, acting like a compensation system for weak accommodation power. This suggests that people in middle age can view 3D images more easily if positive (convex lens) correction is made.

Effects of Long-Time 3D Viewing on the Eye Function of Accommodation and Convergence

“…Then, using the device together with images of very natural and high quality, we have carried out a sequence of experiments on simultaneous measurements of both accommodation and convergence while viewing virtual 3D objects. The results show that there is essentially no discrepancy in the dynamical behaviors of accommodation and convergence especially for young subjects and that they are hence very close to the case of natural viewing of real 3D objects [2][3][4][5][6].…”

“…In the case of middle-aged (over 40 years old) or elder subjects, weak hyperopia is or has already been developed. As a result, for such subjects, dynamical response of accommodation to virtual objects is expected very weak (but not completely vanishing) although they still try to have a clear view of the virtual objects with the help of changing pupil diameter [3,7,8]. For example, when an object approaches closer to the subjects, they unconsciously diminish their pupil diameter to gain the depth of field so that they can perceive the target without blurring [3,7].…”