Repeatability of near visual acuity measurement at high and low contrast
نویسندگان
چکیده
منابع مشابه
MISCELLANEOUS 4 Repeatability of mesopic visual acuity measurements 5 using high - and low - contrast ETDRS letter charts
12 Abstract 13 Purpose To determine the repeatability of mesopic high14 contrast (HC) and low-contrast (LC) visual acuity (VA) mea15 surements made at distance and near in healthy young indi16 viduals. While the repeatability of photopic VA is well17 known, there is a lack of information with regard to the 18 repeatability of VA measured under low luminance 19 conditions. 20 Methods In two diff...
متن کاملA Quantitative Investigation on the Effect of Edge Enhancement for Improving Visual Acuity at Different Levels of Contrast
Background: The major limitation in human vision is refractive error. Auxiliary equipment and methods for these people are not always available. In addition, limited range of accommodation in adult people when switching from a far point to a near point is not simply possible. In this paper, we are looking for solutions to use the facilities of digital image processing and displaying to improve ...
متن کاملDistance and near visual acuity, contrast sensitivity, and visual fields of 10-year-old children.
OBJECTIVE To measure monocular distance visual acuity, near visual acuity, contrast sensitivity, and visual field extent in full-term, 10-year-old children tested according to the protocol used to test 10-year-old preterm children in the Cryotherapy for Retinopathy of Prematurity study. SUBJECTS AND METHODS Subjects were 106 healthy, full-term children, 9.8 to 10.9 years of age, who had no oc...
متن کاملHigh and Low Contrast Visual Acuity Are Not Affected in Amyotrophic Lateral Sclerosis
The afferent visual system may be affected by neuro-degeneration in amyotrophic lateral sclerosis (ALS) based on observations of visual function impairment and retinal inclusions on histopathology in ALS patients. To test the hypothesis that visual acuity is impaired in ALS, we compared three measures of visual acuity in ALS patients (n = 25) attending a multidisciplinary ALS clinic and age mat...
متن کاملStandardized measurement of visual acuity.
The authors reviewed the main aspects of visual acuity evaluation such as the characteristics of the test devices, the notation employed in recording the visual acuity level and the procedures for V.A. assessment, in both distance and near tests. In addition, new ten-letter charts, that tend to follow strictly the standardization guideline suggested by NAS-NRC, are described.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Clinical and Experimental Optometry
سال: 2008
ISSN: 0816-4622,1444-0938
DOI: 10.1111/j.1444-0938.2007.00235.x