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Message: <blockquote data-quote="elkcub" data-source="post: 3574573" data-attributes="member: 14473">Yes, indeed, it's a very complicated topic and subject to different evaluation methods.  It's been known for many years that there is a major difference between line acuity and grating acuity as summarized by Hecht and Mintz (1939) in their seminal paper: "THE VISIBILITY OF SINGLE LINES AT VARIOUS ILLUMINATIONS AND THE RETINAL BASIS OF VISUAL RESOLUTION." Note my deliberate reference to "acuity" as opposed to "resolution," which some purists insist (to put it mildly) belongs in the domain of pure optics, not visual perception.  Be that as it may, as a psychologist I think it's most reasonable to evaluate visual instruments by how well they aid/hinder the various visual acuities.  Ed</blockquote>