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Chang Kyu Lee; Stereroacuity in glaucoma patients. Invest. Ophthalmol. Vis. Sci. 2015;56(7 ):555.
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© ARVO (1962-2015); The Authors (2016-present)
In this study, we compared the near and distant stereo acuity between glaucoma patients and normal group, analyzed the near and distant stereoacuity according to the severity of glaucoma and the type of visual field defect in the glaucoma patients.
94 eyes in 47 patients with glaucoma and 80 eyes in 40 subjects (normal group) enrolled in cross-sectional study between January 2014 and March 2014. Overall 87 subjects were tested about near and distant stereoacuity and all glaucoma patients were evaluated about visual field.
There were statically significant differences in the mean value of near and distant stereoacuity between glaucoma patients and normal group (p=0.000, p=0.000), and the median of near and distant stereoacuity in glaucoma patients showed higher value than normal group. In HAP grading system, mean value and median of near stereoacuity were increased proportionately to severity of glaucoma (p=0.007), but distant stereoacuity showed no correlation according to the severity of glaucoma (p=0.120). The near and distant stereoacuity showed no differences between the subjects with threat to fixation and the subjects with no threat to fixation (p=0.005, p=0.980), but upward tendency of value of near steroacuity appeared in the subjects with threat to fixation. Proportion of reduced stereoacuity in near stereoacuiy was higher in glaucoma patients in compared to normal group (76.2%, 45.5%). In comparison, the proportion of absence of stereoacuity was higher in distant stereoacuity in glaucoma patients comparing to normal group (61.9%, 0%).
Stereoacuity, both near and distant, was significantly higher in glaucoma patients than normal group. In distance stereoacuity test, the proportion of absence of stereoacuity was remarkably high in glaucoma patients. In near stereoacuity test, the more glaucomatous defect progressed, the poorer stereoacuity was scored. But no correlation was detected in the distant stereoacuity. The result that distant stereoacuity seriously deteriorated than the near stereoacuity in glaucoma patient despite no correlation between severity of glaucoma and distant stereoacuity can suggest that distant stereoacuity may be considerably damaged in early stage of glaucoma.
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