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Analysis on Visual Imaging Quality Affected by Human Eye's Higher Order Aberration Measurement via Off-axis Wavefront

Xu Ancheng and Rao Feng

This paper mainly discusses the system design and establishes the experimental system which conducts realtime off-axis measurement of the human eye’s aberration. The target is installed in the optical path of human eye objective measuring system. When observing the target, the human eye adjusts itself to a relaxing state so as to conduct measurement. The target being observed conducts movement vertical to optical axis within its field range, and then realized the off-axis aberration measurement. Research data show that only when normal incidence of the light occurs can changes the human eye’s aberration which caused by measuring errors be minimized. Data from all the objects reveal that second order aberration has the largest proportion among all the aberrations and does not show significant change within the increased off-axis angle in the vision field. Third order aberration increases with the increase of off-axis angle in the vision field. Fourth order aberration shows no obvious increase except the first item. High order aberrations for fifth order and above do not change much with the increase in off-axis angle in the field range. Meanwhile, the proportion of fifth order or above aberrations is the smallest among all the objects’ aberrations. The study results demonstrate that it is the aberrations of the former four orders that have a significant affect on human eye. With regard to off-axis aberration, third order and fourth order affect human eye imaging quality significantly. On the contrary, the high order aberrations of fifth order and above have a minor influence on human eye imaging quality.