López-Gil Norberto, Rucker Frances J, Stark Lawrence R, Badar Mustanser, Borgovan Theodore, Burke Sean, Kruger Philip B
Departamento de Física, Universidad de Murcia, Spain.
Vision Res. 2007 Mar;47(6):755-65. doi: 10.1016/j.visres.2006.08.010. Epub 2007 Feb 5.
We investigate the potential for the third-order aberrations coma and trefoil to provide a signed cue to accommodation. It is first demonstrated theoretically (with some assumptions) that the point spread function is insensitive to the sign of spherical defocus in the presence of odd-order aberrations. In an experimental investigation, the accommodation response to a sinusoidal change in vergence (1-3D, 0.2Hz) of a monochromatic stimulus was obtained with a dynamic infrared optometer. Measurements were obtained in 10 young visually normal individuals with and without custom contact lenses that induced low and high values of r.m.s. trefoil (0.25, 1.03 microm) and coma (0.34, 0.94 microm). Despite variation between subjects, we did not find any statistically significant increase or decrease in the accommodative gain for low levels of trefoil and coma, although effects approached or reached significance for the high levels of trefoil and coma. Theoretical and experimental results indicate that the presence of Zernike third-order aberrations on the eye does not seem to play a crucial role in the dynamics of the accommodation response.
我们研究了三阶像差彗差和三叶草像差为调节提供有符号线索的可能性。首先从理论上（基于一些假设）证明，在存在奇数阶像差的情况下，点扩散函数对球面离焦的符号不敏感。在一项实验研究中，使用动态红外验光仪获得了对单色刺激的聚散度正弦变化（1 - 3D，0.2Hz）的调节反应。在10名视力正常的年轻个体中进行了测量，这些个体佩戴了分别会引起低和高均方根三叶草像差（0.25、1.03微米）和彗差（0.34、0.94微米）的定制隐形眼镜。尽管个体之间存在差异，但对于低水平的三叶草像差和彗差，我们并未发现调节增益有任何统计学上显著的增加或减少，不过对于高水平的三叶草像差和彗差，其影响接近或达到了显著水平。理论和实验结果表明，眼睛上存在的泽尼克三阶像差似乎在调节反应动力学中并不起关键作用。
