The influence of stimulus parameters on the visual field indices by automated projection perimetry
We determined the effect of induced refractive errors on the visual field indices of the Octopus global analysis program G-1. After cycloplegia, refractive errors were introduced randomly in ten nonglaucomatous eyes of ten patients. Mean defect values (+/- S.D.) were lowest (2.4 +/- 0.8 dB) with full cycloplegic correction. With increasing ametropia, the mean defect increased significantly; it was 3.6 +/- 0.8 dB (P less than .0001) with the addition of +1.00 diopter and 5.3 +/- 0.9 dB (P less than .0001) with +2.00 diopters of sphere over the full cycloplegic correction. No significant differences in corrected loss variance, skew, short-term fluctuation, or reliability factor could be determined with changes in refractive error.