Zhang X X, Bradley A, Thibos L N
Department of Visual Sciences, School of Optometry, Indiana University, Bloomington 47405.
J Opt Soc Am A. 1991 Apr;8(4):686-91. doi: 10.1364/josaa.8.000686.
Attempts to correct the chromatic difference of focus of the human eye will introduce unwanted chromatic parallax if the eye is misaligned with the optical axis of the achromatizing system. Using geometrical optics, we show that the amount of parallax is approximately proportional to the amount of misalignment of the eye, with the constant of proportionality equal to the eye's chromatic difference of refractive error. This prediction was confirmed by the experimental determination of chromatic parallax for two commercially available achromatizing lenses. On the basis of these results, we calculated that anticipated improvements in the polychromatic modulation transfer function of the eye offered by achromatizing lenses will be canceled by approximately 0.4 mm of the misalignment between the lens and the eye. Our prediction that further misalignment would severely reduce image quality of the achromatized eye was verified by psychophysical measurements of contrast sensitivity.
如果眼睛与消色差系统的光轴未对准，试图校正人眼焦点的色差将引入不必要的色视差。利用几何光学，我们表明视差量大约与眼睛的未对准量成正比，比例常数等于眼睛的屈光误差色差。这一预测通过对两种市售消色差透镜的色视差进行实验测定得到了证实。基于这些结果，我们计算出消色差透镜为人眼提供的多色调制传递函数的预期改善将被透镜与眼睛之间约0.4毫米的未对准抵消。我们关于进一步未对准将严重降低消色差眼睛图像质量的预测通过对比敏感度的心理物理学测量得到了验证。
