[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).
[5] 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.
Gordon Legge and colleagues introduced the computer based Minnesota low-vision reading test in the year 1989.
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.