Marc Wolf's doctoral thesis describes a way to employ visual evoked potentials for a fully objective acuity evaluation. My role was creating some of the analysis tools and providing mostly technical advice.
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Wolf ME, Maurer JP, Bach M (2005) Objective Estimation of Visual Acuity — High Correlation Across Normal and Diseased Vision with an Automated VEP-Based Algorithm. Proceedings of the 8th Tübinger Perception Conference, p. 110