Contrast Sensitivity Studies and Test- Review
نویسندگان
چکیده
منابع مشابه
Covert attention increases contrast sensitivity: Psychophysical, neurophysiological and neuroimaging studies.
This chapter focuses on the effect of covert spatial attention on contrast sensitivity, a basic visual dimension where the best mechanistic understanding of attention has been achieved. I discuss how models of contrast sensitivity, as well as the confluence of psychophysical, single-unit recording, and neuroimaging studies, suggest that attention increases contrast sensitivity via contrast gain...
متن کاملGrating test of contrast sensitivity in patients with Minamata disease.
Thirty cases of Minamata disease caused by methyl mercury poisoning with the lesion mainly at the occipital cortex were selected and their spatial contrast sensitivity of vision was examined by the Arden grating chart. At the same time their visual acuity, visual field, and visual evoked cortical potential (VECP) were also investigated. In all cases the results of the Arden test indicated abnor...
متن کاملAn evaluation of the Mars Letter Contrast Sensitivity Test.
PURPOSE The Mars Letter Contrast Sensitivity Test (initially known as the Lighthouse Letter Contrast Sensitivity Test) is similar in design to the Pelli-Robson Test but may offer several advantages. This study evaluates the repeatability of the Mars test and its agreement with the Pelli-Robson test in normal and low-vision subjects. METHODS Fifty-four subjects were tested (age 22-86 years), i...
متن کاملImproving the design of the letter contrast sensitivity test.
PURPOSE To develop a small-format letter contrast sensitivity test with improved accuracy, suitable for portable use and near testing, and having a simple and unambiguous scoring system that can be used with reference to existing norms. METHODS A near test, printed on resin-coated paper and mounted on plastic was developed by using Sloan letters, with 0.04 log unit contrast decrements between...
متن کاملContrast sensitivity in multiple sclerosis measured by Cambridge Low Contrast Gratings: a useful clinical test?
The Cambridge Low Contrast Gratings (CLCG) were used to assess contrast sensitivity (CS) in 39 patients with clinically definite multiple sclerosis and 60 control subjects. CS was determined in both horizontal and vertical orientations and compared with visual evoked responses (VERs) in the same populations. Only 33% of patients had abnormal CS whereas 82% had abnormal VERs. There was no correl...
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ژورنال
عنوان ژورنال: Biomedical Journal of Scientific & Technical Research
سال: 2020
ISSN: 2574-1241
DOI: 10.26717/bjstr.2020.27.004439