MNREAD acuity chart
The MNREAD acuity chart or Minnesota low vision reading chart is a text based chart used to measure near visual acuity in people with normal or low vision.[1] It can also be used to measure maximum reading speed, critical print size and the reading accessibility index of a person.[2] Digital and printed types of charts are available.[3]
The MNREAD chart consists of sentences with print size decreasing by 0.1 log unit steps, from 1.3 logMAR (Snellen equivalent 20/400 at 40 cm) to −0.5 logMAR (Snellen equivalent 20/6).[4] Charts are available in many languages. It allows near visual acuity recording in logMAR notation, Snellen notation or M-units.[5]
Procedure[edit]
Since the MNREAD charts use logarithmic pattern of letters, near visual acuity is usually measured at a distance of 40 cm from eyes. For low vision patients, chart can also be used at closer distances.[1] After distance vision correction, near vision is measured with and without near vision correction.
History[edit]
Gordon Legge and colleagues introduced the computer based Minnesota low-vision reading test in the year 1989.[6] In 1993, they introduced a simplified printed version of the test. The chart we use now is developed at the Minnesota Laboratory for Low-Vision Research, University of Minnesota, by Gordon Legge, Steve Mansfield, Andrew Luebker, and Kathryn Cunningham.[7]
See also[edit]
References[edit]
- ^ a b Altinbay, Deniz; Adibelli, Fatih Mehmet; Taskin, Ibrahim; Tekin, Adil (2016). "The Evaluation of Reading Performance with Minnesota Low Vision Reading Charts in Patients with Age-related Macular Degeneration". Middle East African Journal of Ophthalmology. 23 (4): 302–306. doi:10.4103/0974-9233.194078. ISSN 0974-9233. PMC 5141623. PMID 27994393.
- ^ Calabrèse, Aurélie; Cheong, Allen M. Y.; Cheung, Sing-Hang; He, Yingchen; Kwon, MiYoung; Mansfield, J. Stephen; Subramanian, Ahalya; Yu, Deyue; Legge, Gordon E. (1 July 2016). "Baseline MNREAD Measures for Normally Sighted Subjects From Childhood to Old Age". Investigative Ophthalmology & Visual Science. 57 (8): 3836–3843. doi:10.1167/iovs.16-19580. ISSN 1552-5783. PMC 4961000.
- ^ Calabrèse, Aurélie; To, Long; He, Yingchen; Berkholtz, Elizabeth; Rafian, Paymon; Legge, Gordon E. (19 January 2018). "Comparing performance on the MNREAD iPad application with the MNREAD acuity chart". Journal of Vision. 18 (1): 8. doi:10.1167/18.1.8. ISSN 1534-7362. PMC 5774869. PMID 29351351.
- ^ Calabrèse, Aurélie; Owsley, Cynthia; McGwin, Gerald; Legge, Gordon E. (1 April 2016). "Development of a Reading Accessibility Index Using the MNREAD Acuity Chart". JAMA Ophthalmology. 134 (4): 398–405. doi:10.1001/jamaophthalmol.2015.6097. PMC 5369600. PMID 26868760.
- ^ Radner, W. (14 April 2017). "Reading charts in ophthalmology". Graefe's Archive for Clinical and Experimental Ophthalmology. 255 (8): 1465–1482. doi:10.1007/s00417-017-3659-0. ISSN 0721-832X. PMC 5541099. PMID 28411305.
- ^ "MNRead-History | MN Lab for Low-Vision Research". gellab.psych.umn.edu.
- ^ "MNREAD Acuity Charts | MN Lab for Low-Vision Research". gellab.psych.umn.edu.