TABLE 1.

Definitions of Terms Used to Characterize Visual Function Tests in Patients With Multiple Sclerosis and Disease-Free Controls

Acuity Score Term	Definition and Calculation
Monocular acuity  score	Number of letters identified correctly  using either eye separately
Better eye	Eye with greater score for high-  contrast visual acuity (VA) based  on number of letters identified  correctly
Binocular acuity score	Number of letters identified correctly  using both eyes together
Magnitude of  binocular  summation	Extent to which binocular acuity  score is greater than monocular  acuity score for better eye = binocular acuity score minus  better eye acuity score
Binocular inhibition	Binocular acuity score is less than  monocular acuity score for better  eye