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Cory L. Burton, Ashley N. Bartholomew, Charles E. Crabtree, Amy E. Craft, J. Farley Norman; Stereopsis and aging. Journal of Vision 2009;9(8):278. doi: 10.1167/9.8.278.
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© ARVO (1962-2015); The Authors (2016-present)
Two experiments investigated aging and stereopsis. The observers' ages ranged from 18 to 83 years. The overall goal was to challenge the older stereoscopic visual system by utilizing high magnitudes of binocular disparity and by making binocular matching more difficult. Experiment 1 evaluated observers' abilities to discriminate ordinal depth differences away from the horopter using standing disparities of 6.5 to 46 minutes arc. Experiment 2 assessed observers' abilities to discriminate stereoscopic shape using line-element stereograms. The direction (crossed vs. uncrossed) and magnitude of the binocular disparity (13.7 & 51.5 min arc) were manipulated. Binocular matching was made more difficult by varying the orientations of corresponding line elements across the two eyes' views. The results of both experiments revealed that older observers' stereoscopic vision is functionally comparable to that of younger observers in many respects. For example, both age groups exhibited a similar ability to discriminate depth and surface shape. The results also showed, however, that age-related differences in stereopsis do exist, and they become most noticeable when the older stereoscopic system is challenged by multiple simultaneous factors.
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