A new method for objective measurement of visual acuity based on arrest of the optokinetic response has been previously described by one of us1 and a strong positive correlation has been found between subjective Snellen acuity and objective visual acuity (r =0.92 to 0.94). When using direct visual observation of eye movements the method is very rapid.
Other methods of examining visual acuity based on arresting optokinetic nystagmus (OKN) have also been described. Recently Wolin and Dillman2 improved the method described by Ohm in his numerous publications3 to a quantitative examination. These authors use as the arresting factor a white circular spot which appears in the middle of the optokinetic stimulus area. When using the emergence of a bright spot as a measure of visual acuity, the procedure is based chiefly on measuring minimum visible and is not a measure of minimum separable. Nevertheless, Wolin and Dillman
VOIPIO H, HYVARINEN L. Objective Measurement of Visual Acuity by Arrestovisography. Arch Ophthalmol. 1966;75(6):799-802. doi:10.1001/archopht.1966.00970050801017