Purpose. This laboratory study investigates the relation between measures of fixation
disparity (FD)(and other optometric measures) and near vision fatigue at a computer …

A deviation between the angle of convergence during visual work and the resting level of the
vergence system (vergence discrepancy) should be associated with costs; subjects should …

OBJECTIVE: To introduce fixation disparity variance as an objective measure of visual
discomfort. A higher variance in fixation disparity is indicative of more visual fatigue. This …

Myopes of low degree commonly report that their vision seems poorer upon removal of their
spectacles compared to that after a period without spectacle wear. Notably, this difference in …

Previous research has shown that subjects with normal binocular vision differ reliably in the
extent to which their fixation disparity changes in the exo direction when the viewing …

Two experiments examined the link between vergence effort and subjective reports of visual
fatigue following prolonged near work. In Experiment 1, dark vergence and reports of visual …

Purpose When observers focus their stereoscopic visual system for a long time (eg,
watching a 3D movie) they may experience visual discomfort or asthenopia. We tested two …

Some observers do not fixate accurately at the point of regard: Their vergence angle
(between the visual axes of the two eyes) may correspond to points slightly nearer or farther …

Citation information: Leung T‐W, Flitcroft DI, Wallman J, Lee TH, Zheng Y, Lam CS‐Y & Kee
C‐S. A novel instrument for logging nearwork distance. Ophthalmic Physiol Opt 2011, 31 …

Fixation disparity has been shown to be produced by prism stress, and it has therefore been
proposed that its presence constitutes a sign that binocular vision is under stress …