He Ji C, Gwiazda Jane, Thorn Frank, Held Richard
Myopia Research Center, New England College of Optometry, 424 Beacon Street, Boston, Massachusetts 02115, USA.
J Opt Soc Am A Opt Image Sci Vis. 2003 Jul;20(7):1155-63. doi: 10.1364/josaa.20.001155.
In order to investigate the sources of wave-front aberrations in the human eye, we have measured the aberrations of the anterior cornea and the whole eye using a topographic system and a psychophysical wave-front sensor. We have also calculated the aberrations for the internal optics of both eyes of 45 young subjects (aged 9 to 29 years). The mean rms for the anterior cornea was similar to that for the internal optics and thewhole eye when astigmatism was included, but less than that for both the internal optics and the whole eye with astigmatism removed. For eyes with low whole-eye rms values, mean rms for the anterior cornea was greater than that for the whole eye, suggesting that the anterior corneal aberration is partially compensated by the internal optics of the eye to produce the low whole-eye rms. For eyes with larger whole-eye rms values, the rms values for both the anterior cornea and the internal optics were less than that for the whole eye. Thus the aberrations for the two elements tend to be primarily additive. This pattern exists whether or not astigmatism was included in the wave-front aberration rms. For individual Zernike terms, astigmatism and spherical aberration in the anterior cornea were partially compensated by internal optics, while some other Zernike terms showed addition between the anterior cornea and internal optics. Individual eyes show different combinations of compensation and addition across different Zernike terms. Our data suggest that the reported loss of internal compensation for anterior corneal aberrations in elderly eyes with large whole-eye aberrations [J. Opt. Soc. Am. A 19, 137 (2002)] may also occur in young eyes.
为了研究人眼波前像差的来源，我们使用地形测量系统和心理物理学波前传感器测量了前角膜和全眼的像差。我们还计算了45名年轻受试者（年龄在9至29岁之间）双眼内部光学系统的像差。当纳入散光时，前角膜的平均均方根值与内部光学系统和全眼的相似，但去除散光后，前角膜的平均均方根值小于内部光学系统和全眼的。对于全眼均方根值较低的眼睛，前角膜的平均均方根值大于全眼的，这表明前角膜像差部分被眼睛的内部光学系统补偿，从而产生较低的全眼均方根值。对于全眼均方根值较大的眼睛，前角膜和内部光学系统的均方根值均小于全眼的。因此，这两个元件的像差往往主要是相加的。无论波前像差均方根中是否包含散光，这种模式都存在。对于各个泽尼克项，前角膜中的散光和球差部分被内部光学系统补偿，而其他一些泽尼克项则显示前角膜和内部光学系统之间存在相加。不同的眼睛在不同的泽尼克项上表现出补偿和相加的不同组合。我们的数据表明，在全眼像差较大的老年眼中报道的前角膜像差内部补偿的丧失[《美国光学学会志A》19, 137 (2002)]在年轻眼中也可能发生。
