purpose: to evaluate the effect of laser in situ keratomileusis (lasik) on stereoacuity (sa). methods: in this prospective study, 200 patients scheduled for lasik were evaluated for sa preoperatively and one week and one and three months postoperatively by random dot test. patients with preoperative sa worse than 480 sec/arc were excluded. results: patients included 138 female (69%) and 62 male...

Occlusion geometry gives rise to interocular shifts in the positions of binocularly viewed contour junctions. Since these shifts do not give rise to normal binocular disparities, they have been called 'pseudodisparities'. Previous work has shown that the unmatched contour segments of a partially occluded contour at occlusion junctions can be used to recover the geometry of the occluding surface...

BACKGROUND This study compared precision of depth judgements, technical performance and workload using two-dimensional (2D) and three-dimensional (3D) laparoscopic displays across different viewing distances. It also compared the accuracy of 3D displays with natural viewing, along with the relationship between stereoacuity and 3D laparoscopic performance. METHODS A counterbalanced within-subj...

PURPOSE To compare visual performance with the Biofinity multifocal (MF) contact lens with monovision (MV) with the Biofinity single-vision contact lens. METHODS A crossover study of 20 presbyopic patients was conducted. Patients were randomized first into either an MF or an MV lens for 15 days for each modality, with a washout period between each lens type. Measurements included monocular an...