Optometry Research Today is a free monthly online journal that collates and summarizes the latest research about Optometry, including details on myopia, optometric practice, therapy. | ||||||||
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DEVELOPMENT & EVALUATION OF A CONTRAST SENSITIVITY PERIMETRY TEST FOR PATIENTS WITH GLAUCOMA.Hot A, Dul M, Swanson WH SUNY College of Optometry, Astoria, New York, United States. PURPOSE: To design a contrast sensitivity perimetry (CSP) protocol which decreases variability in glaucomatous defects while maintaining good sensitivity to glaucomatous loss. METHODS: Twenty patients with glaucoma and twenty control subjects were tested with a CSP protocol implemented on a monitor-based testing station. The protocol tested 26 locations over the central visual field, using Gabor patches with a peak spatial frequency of 0.4 cycles per degree and a two-dimensional spatial Gaussian envelope with most of the energy concentrated within a 4 degree circular region. Threshold was estimated with a staircase METHOD: Patients and ten age-similar controls were also tested on conventional automated perimetry (CAP) using the 24-2 pattern with the SITA Standard testing strategy. Neuroretinal rim area of the patients was measured using the Heidelberg Retina Tomograph II. Bland-Altman analysis of agreement was used to assess test-retest variability, compare depth of defect for the two perimetric tests, and investigate the relations between contrast sensitivity and neuroretinal rim area. RESULTS: Variability showed less dependence on defect depth for CSP than for CAP (Z=9.3, p < 0.001). Defect depth was similar for CAP and CSP when averaged by quadrant (r=0.26, p > 0.13). The relation between defect depth and rim area was more consistent for CSP than for CAP (Z=9, p < 0.001). CONCLUSION: Our implementation of CSP was successful in reducing test-retest variability in glaucomatous defects. CSP was in general agreement with CAP in terms of depth of defect and was in better agreement than CAP with HRT rim area. Published 1 April 2008 in Invest Ophthalmol Vis Sci.
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