A population study on changes in wave aberrations with accommodation
A population study on changes in wave aberrations with accommodation
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DOI：
10.1167/4.4.3
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发表时间：
2004-01-01
影响因子：
1.8
通讯作者：
Roorda, A
中科院分区：
文献类型：
--
作者：
Cheng, H;Barnett, JK;Roorda, A
当通过Badal系统向被测眼提供0、3和6 D的可调节需求时，用Shack-Hartmann波前传感器（SHWS）测量了大量年轻成年人右眼的波像差。在每个调节需求下记录三张SHWS图像，并计算5毫米瞳孔内的波像差（通过6(6)阶Zernike多项式）。调节响应由中心直径3毫米区域的泽尼克离焦计算。在所有泽尼克项中，球差随调节的变化最大。球差的变化总是负的，并与调节响应的变化成正比。彗差和散光也随调节而变化，但变化方向不同。尽管存在较大的主体间变异性，但在3.0 d的调节水平下，所有像差（不包括离焦）的总体均方根平均值保持不变。即使像差随调节而变化，即使在高调节水平下，像差变化的幅度仍然小于未校正像差的幅度。因此，一个典型的眼睛将受益于整个调节范围（0-6 D），如果像差被纠正为远距离观看。
Wave aberrations were measured with a Shack-Hartmann wavefront sensor (SHWS) in the right eye of a large young adult population when accommodative demands of 0, 3, and 6 D were presented to the tested eye through a Badal system. Three SHWS images were recorded at each accommodative demand and wave aberrations were computed over a 5-mm pupil (through 6(th) order Zernike polynomials). The accommodative response was calculated from the Zernike defocus over the central 3-mm diameter zone. Among all individual Zernike terms, spherical aberration showed the greatest change with accommodation. The change of spherical aberration was always negative, and was proportional to the change in accommodative response. Coma and astigmatism also changed with accommodation, but the direction of the change was variable. Despite the large inter-subject variability, the population average of the root mean square for all aberrations (excluding defocus) remained constant for accommodative levels up to 3.0 D. Even though aberrations change with accommodation, the magnitude of the aberration change remains less than the magnitude of the uncorrected aberrations, even at high accommodative levels. Therefore, a typical eye will benefit over the entire accommodative range (0-6 D) if aberrations are corrected for distance viewing.