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. Author manuscript; available in PMC: 2013 Apr 28.
Published in final edited form as: Am J Ophthalmol. 2011 May 12;152(1):133–140. doi: 10.1016/j.ajo.2011.01.023

FIGURE.

FIGURE

Magnitude of binocular summation for low-contrast letter acuity and high-contrast visual acuity (VA) in multiple sclerosis and disease-free control subjects. Binocular summation = binocular letter score minus better eye letter score for all patient subgroups and all contrast levels. (Top) Results for high-contrast VA. (Middle) Results for low-contrast letter acuity at 2.5% contrast. (Bottom) Results for low-contrast letter acuity at 1.25% contrast. Boxes define the median ± interquartile range. Error bars represent 1.5× the interquartile range. Additional points represent outliers. Multiple sclerosis patients without optic neuritis had significantly (P = .015) higher binocular summation scores than those with a history of optic neuritis for 1.25% low-contrast acuity. MS = multiple sclerosis, ON = optic neuritis.