Fortunately, resolution acuity is extremely robust against refractive blur. Although detection acuity varies strongly with defocus, resolution acuity is independent of defocus over a range of several diopters. This means that it is only necessary to get the refractive error roughly correct. Fortunately there is a built in check to see if close enough is good enough. So long as detection acuity exceeds resolution acuity, aliasing is indicated and we conclude that resolution remains sampling limited.

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WWWaveTM 1995
World Wide Web automated virtual environment TM 1995
Kevin Haggerty, Indiana University.
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