Whitefoot H D, Charman W N
Department of Optometry and Vision Sciences, University of Manchester Institute of Science and Technology, UK.
Ophthalmic Physiol Opt. 1995 Jan;15(1):13-22.
It has been suggested that a 'hyperchromatic' lens which enhanced the longitudinal chromatic aberration (LCA) of the eye would increase its depth of focus (DOF) and hence might prove a useful aid to presbyopes who have lost their natural ability to accommodate for different distances. Experiments are described in which high- and low-contrast visual acuity, and contrast sensitivity were measured as a function of object vergence using the naked eye and various levels of effective lens-eye LCA. It was found that doubling the effective lens-eye LCA increased total DOF in the high-contrast acuity task by about 0.5 D, while correcting the ocular LCA reduced DOF by about 0.3 D. On the other hand, enhanced LCA led to some loss in performance in the low-contrast acuity task and in contrast sensitivity.
有人提出，一种能增强眼睛纵向色差（LCA）的“增色”镜片会增加其焦深（DOF），因此可能对那些失去自然调节不同距离能力的老花眼患者有帮助。本文描述了一些实验，其中使用裸眼和不同水平的有效镜片-眼睛LCA，测量了高对比度和低对比度视力以及对比敏感度随物方聚散度的变化。结果发现，将有效镜片-眼睛LCA加倍，在高对比度视力任务中总焦深增加约0.5 D，而校正眼睛LCA则使焦深减少约0.3 D。另一方面，增强的LCA导致低对比度视力任务和对比敏感度的性能有所下降。
