Vargas-Martín F, Prieto P M, Artal P
Departamento de Físcia, Universidad de Murcia, Campus de Espinardo (Edificio C), Murcia, Spain.
J Opt Soc Am A Opt Image Sci Vis. 1998 Sep;15(9):2552-62. doi: 10.1364/josaa.15.002552.
We evaluated the performance of a liquid-crystal spatial light modulator for static correction of the aberrations in the human eye. By applying phase-retrieval techniques to pairs of double-pass images we first estimated the wave aberration of the eye to be corrected. Then we introduced the opposite phase map in the modulator, which was placed in a plane conjugated with the eye's pupil, and we recorded double-pass images of a point source before and after correction of the aberrations. In a slightly aberrated artificial eye a clear improvement was obtained after correction, and, although diffraction-limited performance was not achieved, the results were close to the theoretical predictions. In the two living eyes that we studied some benefit also appeared in the correction, but the performance was worse than that expected. We evaluated possible explanations for the relatively poor performance that was obtained in the human eye: an incorrect estimate of the ocular aberration, the limited spatial resolution of the modulator, and the dynamic changes in the ocular aberrations. Based on the results in the artificial eye, the first problem was not considered to be a major source of error. However, we showed that the spatial resolution of the liquid-crystal spatial light modulator limits the maximum correction to be attained. In addition, the changes in the ocular optics over time also impose a limit in the performance of static corrections.
我们评估了一种液晶空间光调制器对人眼像差进行静态校正的性能。通过对双程图像对应用相位恢复技术，我们首先估计了待校正的眼睛的波前像差。然后，我们在放置于与眼睛瞳孔共轭平面的调制器中引入相反的相位图，并记录了像差校正前后点光源的双程图像。在一个轻度像差的人工眼中，校正后获得了明显的改善，并且，尽管未达到衍射极限性能，但结果接近理论预测。在我们研究的两只活眼中，校正也显示出了一些益处，但性能比预期的要差。我们评估了在人眼中获得相对较差性能的可能原因：眼像差的估计错误、调制器有限的空间分辨率以及眼像差的动态变化。基于人工眼的结果，第一个问题不被认为是主要的误差来源。然而，我们表明液晶空间光调制器的空间分辨率限制了可实现的最大校正量。此外，眼光学系统随时间的变化也对静态校正的性能造成了限制。
