Evaluation of point spread function of the peripheral visual field in human eye

我们评估了周围视网膜图像质量的关系，有晶状眼和假晶状眼。人们普遍认为，人体晶状体的存在仅仅是为了调节，但这一假设还没有以一种考虑到外围光学的方式得到充分的检验，即离焦分量和高阶像差。使用人工晶状体的眼睛在相对外周离焦方面的差异似乎比使用晶状体的眼睛更大。我们比较了人类晶状体与人工晶状体的最佳离轴psf，我们的结果表明了人类晶状体的重要性和迄今为止未被揭示的生理作用；也就是说，人体的晶状体起到缓冲作用，防止周围视觉因离焦和像差而模糊。

We evaluated the peripheral retinal image quality in relation to phakic and pseudophakic eyes. It has been widely assumed that the human crystalline lens exists solely for accommodation, but this assumption has not fully been tested in a manner that takes account of peripheral optics, i.e., the defocus component and higher-order aberrations. The difference in relative peripheral defocus seems to be even larger in eyes with artificial IOLs than with crystalline lenses. We compared the best off-axis PSFs of human lenses with those of artificial IOLs, and our results suggest the importance and a heretofore unrevealed physiological role of the human lens; namely, the human lens acts as a buffer to protect against blurring in the peripheral vision in terms of defocus and aberration.