House P H, Drance S M, Schulzer M, Wijsman K
Department of Ophthalmology, University of British Columbia, Vancouver, Canada.
Acta Ophthalmol (Copenh). 1990 Feb;68(1):87-90. doi: 10.1111/j.1755-3768.1990.tb01655.x.
To determine the effect of optically induced blur on the visual field measured with high pass spatially filtered targets, 10 normal subjects had field examinations with 0 diopter + 1.00 diopter or + 2.00 diopter of overcorrection in the cyclopleged state. All subjects showed a significant loss of sensitivity when defocussed, but not with pupil dilation. Mean thresholds for the central field rose from 4.79 +/- 0.68 dB (Mean +/- SD) with the image focussed and pupil dilated, to 7.16 +/- 0.72 dB with two diopters of image blur (P less than 0.001). The effects of defocussing did not differ significantly between the central and peripheral parts of the field. The great influence of defocussing the image on sensitivity should be considered during clinical perimetry as the 2.37 dB decline shown would place the group's mean sensitivity below the fifth percentile for age corrected normals.
为了确定光学诱导模糊对使用高通空间滤波目标测量的视野的影响，10名正常受试者在睫状肌麻痹状态下进行了屈光度为0、过矫+1.00屈光度或+2.00屈光度的视野检查。所有受试者在散焦时均表现出明显的敏感度下降，但瞳孔散大时未出现。中心视野的平均阈值从图像聚焦且瞳孔散大时的4.79 +/- 0.68 dB（平均值 +/- 标准差），上升到图像模糊两屈光度时的7.16 +/- 0.72 dB（P < 0.001）。视野中央和周边部分散焦的影响没有显著差异。在临床视野检查中应考虑图像散焦对敏感度的巨大影响，因为所示的2.37 dB下降会使该组的平均敏感度低于年龄校正正常范围的第五百分位数。
