Atchison David A, Guo Huanqing, Charman W N, Fisher S W
School of Optometry and Institute of Health and Biomedical Innovation, Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, Qld 4059, Australia.
Vision Res. 2009 Sep;49(19):2393-403. doi: 10.1016/j.visres.2009.07.009. Epub 2009 Jul 23.
We investigated the limits at which blur due to defocus, crossed-cylinder astigmatism, and trefoil became noticeable, troublesome or objectionable. Black letter targets (0.1, 0.35 and 0.6 logMAR) were presented on white backgrounds. Subjects were cyclopleged and had effectively 5mm pupils. Blur was induced with a deformable, adaptive-optics mirror operating under open-loop conditions. Mean defocus blur limits of six subjects with uncorrected intrinsic higher-order ocular aberrations ranged from 0.18+/-0.08 D (noticeable blur criterion, 0.1 logMAR) to 1.01+/-0.27 D (objectionable blur criterion, 0.6 logMAR). Crossed-cylinder astigmatic blur limits were approximately 90% of those for defocus, but with considerable meridional influences. In two of the subjects, the intrinsic aberrations of the eye were subsequently corrected before the defocus and astigmatic blur were added. This resulted in only minor reductions in their blur limits. When assessed with trefoil blur and corrected intrinsic ocular aberrations, the ratio of objectionable to noticeable blur limits in these two subjects was much higher for trefoil (3.5) than for defocus (2.5) and astigmatism (2.2).
我们研究了因散焦、交叉柱镜散光和三叶草像差导致的模糊变得明显、令人烦恼或令人反感的限度。在白色背景上呈现黑色字母视标（0.1、0.35和0.6 logMAR）。受试者进行了睫状肌麻痹，有效瞳孔直径为5mm。通过在开环条件下操作的可变形自适应光学镜诱导模糊。六名具有未矫正固有高阶眼像差的受试者的平均散焦模糊限度范围从0.18±0.08 D（明显模糊标准，0.1 logMAR）到1.01±0.27 D（令人反感的模糊标准，0.6 logMAR）。交叉柱镜散光模糊限度约为散焦模糊限度的90%，但有相当大的子午线影响。在其中两名受试者中，在添加散焦和散光模糊之前，随后矫正了眼睛的固有像差。这仅导致其模糊限度略有降低。当用三叶草像差模糊和矫正后的固有眼像差进行评估时，这两名受试者中令人反感的模糊限度与明显模糊限度之比，三叶草像差（3.5）远高于散焦（2.5）和散光（2.2）。
