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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Bach M, Maurer JP, Wolf ME (2008) Visual evoked potential-based acuity assessment in normal vision, artificially degraded vision, and in patients. Brit J Ophthalmol 92:396–403
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