Iglesias I, Berrio E, Artal P
Departamento de Física, Universidad de Murcia, Spain.
J Opt Soc Am A Opt Image Sci Vis. 1998 Sep;15(9):2466-76. doi: 10.1364/josaa.15.002466.
We apply a computational technique to retrieve the wave aberration of the eye from the point-spread function obtained from pairs of double-pass retinal images. The method consists of an adapted pyramidal version of a nonlinear least-squares fitting procedure to a wave aberration expressed as an expansion in Zernike polynomials. Although the procedure provides accurate estimates of the wave aberration, it presents several drawbacks that are discussed in detail. In particular, since a great deal of computational time is necessary to retrieve a single wave aberration, this technique is not useful for real-time applications. We present results of wave aberrations in five normal subjects in the fovea for a 4-mm-pupil diameter. In every case there is a clear presence of comalike aberrations, while the third-order spherical aberration is usually smaller than previous estimates. The root-mean-square error in the retrieved wave aberration, when defocus and astigmatism were corrected, ranges from 0.24 to 0.5 wavelength. The particular values of the aberration coefficients present a large intersubject variability.
我们应用一种计算技术，从通过双程视网膜图像对获得的点扩散函数中检索眼睛的波像差。该方法包括对以泽尼克多项式展开表示的波像差进行非线性最小二乘拟合过程的改进金字塔版本。尽管该过程提供了波像差的准确估计，但它存在几个缺点，将详细讨论。特别是，由于检索单个波像差需要大量的计算时间，因此该技术对实时应用无用。我们给出了五名正常受试者在4毫米瞳孔直径下中央凹处的波像差结果。在每种情况下，明显存在彗差类像差，而三阶球差通常小于先前的估计值。在校正离焦和散光后，检索到的波像差的均方根误差范围为0.24至0.5个波长。像差系数的特定值在个体之间存在很大差异。
