散焦对边缘对比度敏感度的影响。

The effect of defocus on edge contrast sensitivity.

作者信息

Jansonius N M, Kooijman A C

机构信息

Laboratory for Experimental Ophthalmology, University of Groningen, The Netherlands.

出版信息

Ophthalmic Physiol Opt. 1997 Mar;17(2):128-32.

PMID:9196675

Abstract

The effect of optical blur (defocus) on edge contrast sensitivity was studied. Edge contrast sensitivity detoriates with fairly small amounts of blur (approximately 0.5 D) and is roughly reduced by half for each dioptre of blur. The effect of blur on edge contrast sensitivity equals the effect of blur on sine wave contrast sensitivity for a spatial frequency of approximately 3 cpd.

摘要

研究了光学模糊（散焦）对边缘对比度敏感度的影响。边缘对比度敏感度在相当少量的模糊（约0.5屈光度）时就会下降，并且每增加1屈光度的模糊，其大致会降低一半。对于空间频率约为3周/度的情况，模糊对边缘对比度敏感度的影响等同于其对正弦波对比度敏感度的影响。