Psychophysics in the ophthalmological practice—Ⅱ.Contrast sensitivity  

作　　者：Claudio Rosa Carlo Aleci 

机构地区：[1]Department of Ophthalmology,University of Turin,Molinette Hospital,Turin,Italy

出　　处：《Annals of Eye Science》2022年第4期27-39,共13页眼科学年鉴（英文）

摘　　要：Contrast is the differential luminance between one object and another.Contrast sensitivity(CS)quantifies the ability to detect this difference:estimating contrast threshold provides information about the quality of vision and helps diagnose and monitor eye diseases.High contrast visual acuity assessment is traditionally performed in the eye care practice,whereas the estimate of the discrimination of low contrast targets,an important complementary task for the perception of details,is far less employed.An example is driving when the contrast between vehicles,obstacles,pedestrians,and the background is reduced by fog.Many conditions can selectively degrade CS,while visual acuity remains intact.In addition to spatial CS,“temporal”CS is defined as the ability to discriminate luminance differences in the temporal domain,i.e.,to discriminate information that reaches the visual cortex as a function of time.Likewise,temporal sensitivity of the visual system can be investigated in terms of critical fusion frequency(CFF),an indicator of the integrity of the magnocellular system that is responsible for the perception of transient stimulations.As a matter of fact,temporal resolution can be abnormal in neuro-ophthalmological clinical conditions.This paper aims at considering CS and its application to the clinical practice.

关 键 词：Contrast sensitivity(CS) MAGNOCELLULAR sine-wave grating temporal processing FLICKER 

分 类 号：R77[医药卫生—眼科]