Charman W N
Br J Physiol Opt. 1979;33(2):10-20.
While sinusoidal grating stimuli are finding increasing application in clinical tests for visual disturbance, the possible effects on the test results of simple defocus of the retinal image, due to refractive or accommodative error, are not always acknowledged. Theoretical considerations and experimental measurements emphasize that the degradation in visual performance due to such defocus effects is minimal when the eye pupil is small and the spatial frequency of the grating test objects is low.
虽然正弦光栅刺激在视觉障碍的临床测试中应用越来越广泛，但由于屈光或调节误差导致视网膜图像简单散焦对测试结果可能产生的影响却并非总是得到认可。理论考量和实验测量都强调，当眼睛瞳孔较小且光栅测试物体的空间频率较低时，这种散焦效应导致的视觉性能下降是最小的。
