Related Experiment Video
Updated: Dec 23, 2025
Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
Published on: March 29, 2022
Establishing an Objective Measurement of Visual Acuity with a Computerised Optokinetic Nystagmus Suppression Test
Noemie Schwob1, Anja Palmowski-Wolfe2
1Neuroophthalmology, Universitätsspital Basel Augenklinik, Basel, Switzerland.
Objective:
Investigating the correlation between subjective and objective VA (visual acuity) elicited with a newly developed computerised optokinetic nystagmus (OKN) suppression test ("SpeedWheel") in adults.
Methods:
SpeedWheel presented alternating black/white stripes moving horizontally across a LED screen. Seven VA steps were induced with Bangerter filters placed onto spectacle frames. Magnified eye movements were projected from infrared cameras inside the frames and displayed onto a smartphone. Dots whose size increased in logarithmic steps were superimposed to suppress OKN. Suppression of OKN resulted in the SpeedWheel acuity which was then correlated to Snellen acuity as measured with the Freiburg Acuity test.
Results:
28 eyes from 14 individuals were tested. FrACT-E correlated well to SpeedWheel (r: 0.89; p < 0.001). Snellen acuity was never lower than 0.14 LogMAR of SpeedWheel values. Bangerter filters showed greater mean difference to both methods indicating that this filter is not as predictable as suggested by the filter value.
Conclusion:
SpeedWheel offers a fast (< 80 sec) and reliable alternative option to measure objective VA.
