Marcos Susana, Sawides Lucie, Gambra Enrique, Dorronsoro Carlos
Instituto de Optica, Consejo Superior de Investigaciones Científicas, CSIC, Madrid, Spain.
J Vis. 2008 Oct 6;8(13):1.1-12. doi: 10.1167/8.13.1.
We evaluated the visual benefit of correcting astigmatism and high-order aberrations with adaptive optics (AO) on visual acuity (VA) measured at 7 different luminances (ranging from 0.8 to 50 cd/m(2)) and two contrast polarities (black letters on white background, BoW, and white letters on black background, WoB) on 7 subjects. For the BoW condition, VA increased with background luminance in both natural and AO-corrected conditions, and there was a benefit of AO correction at all luminances (by a factor of 1.29 on average across luminances). For WoB VA increased with foreground luminance but decreased for the highest luminances. In this reversed polarity condition AO correction increased VA by a factor of 1.13 on average and did not produce a visual benefit at high luminances. The improvement of VA (averaged across conditions) was significantly correlated (p = 0.04) with the amount of corrected aberrations (in terms of Strehl ratio). The improved performance with WoB targets with respect to BoW targets is decreased when correcting aberrations, suggesting a role of ocular aberrations in the differences in visual performance between contrast polarities.
我们评估了在7名受试者中，使用自适应光学（AO）矫正散光和高阶像差对在7种不同亮度（范围从0.8至50 cd/m²）以及两种对比度极性（白底黑字，BoW，和黑底白字，WoB）下测量的视力（VA）的视觉益处。对于BoW条件，在自然和AO矫正条件下，视力均随背景亮度增加，并且在所有亮度下AO矫正均有益处（在所有亮度上平均提高1.29倍）。对于WoB，视力随前景亮度增加，但在最高亮度时下降。在这种反转极性条件下，AO矫正平均使视力提高1.13倍，并且在高亮度时未产生视觉益处。视力的改善（跨条件平均）与矫正像差的量（以斯特列尔比衡量）显著相关（p = 0.04）。在矫正像差时，与BoW目标相比，WoB目标的性能改善有所降低，这表明眼像差在对比度极性之间的视觉性能差异中起作用。
