Carmichael Martins Alessandra, Vohnsen Brian
Advanced Optical Imaging Group, School of Physics, University College Dublin, Dublin D04, Ireland.
Micromachines (Basel). 2019 Feb 12;10(2):117. doi: 10.3390/mi10020117.
The Hartmann⁻Shack wavefront sensor is widely used to measure aberrations in both astronomy and ophthalmology. Yet, the dynamic range of the sensor is limited by cross-talk between adjacent lenslets. In this study, we explore ocular aberration measurements with a recently-proposed variant of the sensor that makes use of a digital micromirror device for sequential aperture scanning of the pupil, thereby avoiding the use of a lenslet array. We report on results with the sensor using two different detectors, a lateral position sensor and a charge-coupled device (CCD) scientific camera, and explore the pros and cons of both. Wavefront measurements of a highly aberrated artificial eye and of five real eyes, including a highly myopic subject, are demonstrated, and the role of pupil sampling density, CCD pixel binning, and scanning speed are explored. We find that the lateral position sensor is mostly suited for high-power applications, whereas the CCD camera with pixel binning performs consistently well both with the artificial eye and for real-eye measurements, and can outperform a commonly-used wavefront sensor with highly aberrated wavefronts.
哈特曼-夏克波前传感器广泛应用于天文学和眼科领域的像差测量。然而，该传感器的动态范围受到相邻微透镜之间串扰的限制。在本研究中，我们探索了一种最近提出的该传感器变体用于眼部像差测量，该变体利用数字微镜器件对瞳孔进行顺序孔径扫描，从而避免使用微透镜阵列。我们报告了使用两种不同探测器（横向位置传感器和电荷耦合器件（CCD）科学相机）的传感器的结果，并探讨了两者的优缺点。展示了对高度像差人工眼和包括高度近视受试者在内的五只真实眼睛的波前测量，并探讨了瞳孔采样密度、CCD像素合并和扫描速度的作用。我们发现横向位置传感器最适合高功率应用，而具有像素合并功能的CCD相机在人工眼和真实眼睛测量中均表现出色，并且在高度像差波前的情况下可以优于常用的波前传感器。
