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
Visual impairment, also known as vision impairment, is a medical definition primarily measured based on an individual's better eye visual acuity; in the absence of treatment such as correctable eyewear, assistive devices, and medical treatment†...
.
It can also be used to measure maximum reading speed, critical print size and the reading accessibility index of a person.
Digital and printed types of charts are available.
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).
Charts are available in many languages. It allows near visual acuity recording in logMAR notation, Snellen notation or M-units.
Procedure
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.
After distance vision correction, near vision is measured with and without near vision correction.
History
Gordon Legge
Gordon Ernest Legge (born January 22, 1948) is currently the Distinguished McKnight University Professor and former chair of the Department of Psychology at the University of Minnesota. Legge is the director othe Minnesota Laboratory for Low-Visio ...
and colleagues introduced the computer based Minnesota low-vision reading test in the year 1989. 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
The University of Minnesota, formally the University of Minnesota, Twin Cities, (UMN Twin Cities, the U of M, or Minnesota) is a public university, public Land-grant university, land-grant research university in the Minneapolis–Saint Paul, Tw ...
, by Gordon Legge, Steve Mansfield, Andrew Luebker, and Kathryn Cunningham.
See also
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Jaeger chart
The Jaeger chart is an eye chart used in testing near vision acuity. It is a card on which paragraphs of text are printed, with the text sizes increasing from 0.37 mm to 2.5 mm. This card is to be held by a patient at a fixed distance from the ey ...
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Eye chart
__NOTOC__
An eye chart, or optotype, is a chart used to subjectively measure visual acuity. Eye charts are often used by health care professionals, such as optometrists, physicians or nurses, to screen persons for vision impairment. Ophthalmologi ...
References
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Diagnostic ophthalmology