The optical quality of the monochromatic retinal image as a function of focus.

W N Charman, J A Jennings
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Abstract

Changes in retinal image quality with focus for an aberration-free eye with a 5-mm pupil are discussed in terms of both geometrical and physical optics. Further modulation transfer function curves illustrate the effect of spherical aberration. These theoretical results are compared with analogous experimental data obtained at different wavelengths with quasi-monochromatic illumination, using a double-pass photo-electric, scanning instrument. The comparison shows that the approximations of geometrical optics predict ocular performance quite well, provided that the errors of focus are reasonably large (greater than or equal to 0.5 DS for a 5-mm entrance pupil). Possible sources of error in the experimental measurements are indicated.

作为焦点函数的单色视网膜图像的光学质量
在视网膜图像质量的变化与聚焦为一个无像差的眼睛与一个5毫米的瞳孔讨论在几何和物理光学方面。进一步的调制传递函数曲线说明了球差的影响。利用双通道光电扫描仪器,将这些理论结果与在准单色照明下不同波长下获得的类似实验数据进行了比较。对比结果表明,几何光学近似法可以很好地预测人眼的视觉性能,但前提是聚焦误差相当大(5-mm入瞳误差大于或等于0.5 DS)。指出了实验测量中可能的误差来源。
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