Effect of rotation and translation on the expected benefit of an ideal method to correct the eye's higher-order aberrations
Effect of rotation and translation on the expected benefit of an ideal method to correct the eye's higher-order aberrations
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DOI：
10.1364/josaa.18.001003
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发表时间：
2001-05-01
影响因子：
1.9
通讯作者：
Cox, IG
中科院分区：
文献类型：
--
作者：
Guirao, A;Williams, DR;Cox, IG
理想的矫正方法，例如定制隐形眼镜、激光屈光手术或自适应光学，可以矫正高阶像差以及散焦和散光，可以改善视力。这种理想方法所带来的好处将受到去中心化的限制。为了估计这种潜在限制的重要性，我们研究了当理想的校正方法相对于眼睛的瞳孔平移或旋转时对图像质量的影响。使用 Shack-Hartmann 传感器从 10 只人眼的 7.3 毫米瞳孔获得实际波像差。我们计算了由于平移或旋转其他理想校正而出现的残余像差。该模型对于自适应光学器件、隐形眼镜和相位板有效，但它仅构成发生组织去除的激光屈光手术案例的第一近似。计算表明，典型的偏心只会略微降低理想校正方法所预期的光学效益。对于典型的偏心，理想的校正方法提供的调制效果比散焦和像散的标准校正高 2-4 倍（白光下为 1.5-2 倍）。我们获得了分析表达式，显示了平移和旋转对各个 Zernike 项的影响。这些计算还揭示了哪些像差最有利于纠正。我们提供了实用的规则来根据偏心量实施选择性校正。使用自适应光学系统校正像差的人工光源进行了实验研究，验证了理论预测。圆锥角膜受试者的结果也通过自适应光学进行矫正，表明尽管高度像差的眼睛出现偏心，但仍然获得了重要的好处。 (C) 2001 年美国光学学会。
ideal correcting method, such as a customized contact lens, laser refractive surgery, or adaptive optics, that corrects higher-order aberrations as well as defocus and astigmatism could improve vision. The benefit achieved with this ideal method will be limited by decentration. To estimate the significance of this potential limitation we studied the effect on image quality expected when an ideal correcting method translates or rotates with respect to the eye's pupil. Actual wave aberrations were obtained from ten human eyes for a 7.3-mm pupil with a Shack-Hartmann sensor. We computed the residual aberrations that appear as a result of translation or rotation of an otherwise ideal correction. The model is valid for adaptive optics, contact lenses, and phase plates, but it constitutes only a first approximation to the laser refractive surgery case where tissue removal occurs. Calculations suggest that the typical decentrations will reduce only slightly the optical benefits expected from an ideal correcting method. For typical decentrations the ideal correcting method offers a benefit in modulation 2-4 times higher (1.5-2 times in white light) than with a standard correction of defocus and astigmatism We obtained analytical expressions that show the impact of translation and rotation on individual Zernike terms. These calculations also reveal which aberrations are most beneficial to correct. We provided practical rules to implement a selective correction depending on the amount of decentration. An experimental study was performed with an aberrated artificial eve corrected with an adaptive optics system, validating the theoretical predictions. The results in a keratoconic subject, also corrected with adaptive optics, showed that important benefits are obtained despite decentrations in highly aberrated eyes. (C) 2001 Optical Society of America.