The Letter Contrast Sensitivity Test: Clinical Evaluation of a New Design
نویسندگان
چکیده
منابع مشابه
The letter contrast sensitivity test: clinical evaluation of a new design.
PURPOSE To compare the reliability, validity, and responsiveness of the Mars Letter Contrast Sensitivity (CS) Test to the Pelli-Robson CS Chart. METHODS One eye of 47 normal control subjects, 27 patients with open-angle glaucoma, and 17 with age-related macular degeneration (AMD) was tested twice with the Mars test and twice with the Pelli-Robson test, in random order on separate days. In add...
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 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 کاملThe Design of a New Letter Chart for Measuring Contrast Sensitivity
I. A consideration of methods for assessing contrast sensitivity leads to the conclusion that, for a clinical test, letters are more suitable than gratings. 2. A letter chart is described in which letters decrease in contrast but not in size. The letters are arranged in groups of three; successive groups decrease in contrast by a factor of IfJ2 from a very high contrast down to a contrast below...
متن کاملthe effect of functional/notional approach on the proficiency level of efl learners and its evaluation through functional test
in fact, this study focused on the following questions: 1. is there any difference between the effect of functional/notional approach and the structural approaches to language teaching on the proficiency test of efl learners? 2. can a rather innovative language test referred to as "functional test" ge devised so so to measure the proficiency test of efl learners, and thus be as much reliable an...
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ژورنال
عنوان ژورنال: Investigative Opthalmology & Visual Science
سال: 2006
ISSN: 1552-5783
DOI: 10.1167/iovs.05-1419