A method to predict refractive errors from wave aberration data
A method to predict refractive errors from wave aberration data
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DOI：
10.1097/00006324-200301000-00006
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发表时间：
2003-01-01
影响因子：
1.4
通讯作者：
Williams, DR
中科院分区：
文献类型：
--
作者：
Guirao, A;Williams, DR
我们探讨了眼睛的高阶像差对主观验光的影响，比较了两类用于估计屈光状态的方法，一种是直接基于瞳孔平面中定义的波像差，另一种是基于视网膜图像平面。在光瞳平面中定义的方法选择使波像差均方根最小化或使波像差中的所有球面和柱面分量的总和最小化的球面和柱面。在图像平面中定义的方法选择优化图像质量度量的球体和圆柱体，例如Strehl强度比、点扩散函数的熵和强度方差、调制传递函数下的体积或对比度敏感度函数下的体积。所有这些方法进行了比较，在人口的六只眼睛，我们测量了波像差与Shack-Hartmann波前传感器和主观验光在相同的条件下。瞳孔平面法对主观验光的预测较差。预测的平均绝对误差，在球镜当量，约为0.5 D（范围，0.1至0.8 D），并增加高阶像差的增加。然而，对于所有的视网膜图像平面方法，预测和主观验光之间的平均误差约为0.1 D（范围，0至0.25 D）。基于图像质量优化的方法的可靠性在146只眼睛的大人群中得到进一步证实。总之，高阶像差影响矫正视力所需的球镜和柱镜数量。结果表明，主观验光可以预测从眼睛的光学单独优化计算视网膜图像质量。
We explored the impact of the eye's higher-order aberrations on subjective refraction comparing two classes of methods for estimating refractive state, one based directly on the wave aberration defined in the pupil plane and another based on the retinal image plane. The method defined in the pupil plane chose the sphere and cylinder that either minimized the wave aberration root mean square or minimized the sum of all the spherical and cylindrical components in the wave aberration. The method defined in the image plane chose the sphere and cylinder that optimized an image-quality metric such as the Strehl intensity ratio, the entropy and the intensity variance of the point-spread function, the volume under the modulation transfer function, or the volume under the contrast-sensitivity function. All these methods were compared in a population of six eyes for which we measured both the wave aberration with a Shack-Hartmann wavefront sensor and the subjective refraction under identical conditions. Pupil plane methods predicted subjective refraction poorly. The mean absolute error of the prediction, in spherical equivalent, was about 0.5 D (range, 0.1 to 0.8 D) and increased with increases in higher-order aberrations. However, for all the retinal image plane methods, the mean error between predicted and subjective refraction was about 0.1 D (range, 0 to 0.25 D). The reliability of the method based on the image-quality optimization was further confirmed in a large population of 146 eyes. In conclusion, higher-order aberrations influence the amount of sphere and cylinder required to correct vision. The results indicate that subjective refraction can be predicted from the eye's optics alone by optimizing computed retinal image quality.