Νatural pupil diameter (in mm) during binocular / monocular VEP recordings and for two luminance levels.

The non-dominant eye was wearing a contact lens with an aperture of 2.5 or 1.5 mm in diameter. The values in parentheses correspond to the interocular illuminance ratio, i.e. the ratio of the retinal illuminance in the dominant eye to that of the non-dominant eye, calculated from the relative pupil areas.