Uncollimated light beam illumination during the ocular aberration detection and its impact on the measurement accuracy by using Hartmann-Shack wavefront sensor

The impact on the measurement accuracy caused by uncollimated illumination beam during the process of human eye aberration measurement by using Hartmann-Shack wavefront sensor has been studied. The principle of Hartmann-Shack wavefront sensor has been introduced. The diopter curve corresponding to the installation errors of lens has been calculated. And the according curve reveals that the diopter of illumination beam at the section of entrance pupil is quite sensitive to the installation errors of lens. The impact on wavefront at the exit pupil under the illumination of uncollimated beam has been analyzed and relative experiments have been done. The experiments show seldom impact of it. Quantitative relationship between the precision of ocular aberration measurement and installation errors of lens is proposed. Experiments to quantitatively simulate the installation errors have been done. The experimental results are in accordance with the theoretical analysis we made and the collimation of illumination beam has an obvious and direct influence on the measurement precision of ocular aberration.

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