[The influence of target blurring and simulated opacity of the ocular media on automated perimetric thresholds]

The influence of target blurring and simulated opacity of the ocular media on the sensitivity of the central visual field in quantitative static perimetry was studied using a SARGON program of the automated perimeter Octopus 201. Ten eyes of 10 normal subjects aged from 21 to 35 were examined with target sizes 1, 3, and 5; 4 spherical plus lenses of +1.0D, +2.0D, +3.0D, and +5.0D; 5 kinds of occlusion diffusers which corresponded to the visual acuities of 1.0, 0.8, 0.6, 0.4, and 0.1; and 4 neutral density filters of 0.1, 0.3, 0.6, and 1.0 log units. The studies suggested that there was little difference between the sensitivity for target size 1 and that for target size 3 in spite of slight blurring of the target and simulated opacity of the ocular media. We concluded that target size 1 was as useful as target size 3 in quantitative static perimetry.