The subjects’ reported symptoms of visual discomfort are summarized in Ta- ble 1. Nine subjects reported monocular ocular irritating symptoms. Asthenopia (N=6) was associated with eye strain but also occurred alone. Others reported blurry vision (N=19), either at distance or near, or both, in one eye. Others noted spatial perception problems (N=8), in- cluding decreased stereopsis and print floating/moving on the page. Four others reported difficulty adjusting to a new cor- rective lens prescription. Refraction Ninety one percent of the subjects wore spectacles and 75% of them were presbyopic. Overall, there were no high levels of anisometropia. Seventy-seven percent (27 of 35) of the subjects exhibited a dioptric difference between the two eyes of D. Four subjects had a.
