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Instruments validation needs proper models.

I read with some disappointment the article "Evaluating data acquisition and smoothing functions of currently available videokeratoscopes" by M.W.Belin, MD, and C.D.Ratliff, MD1 (from now on "the article" and "the authors" for brevity) whose abstracts Results state that "None of the system accurately imaged all objects." and that "Sources of error included excessive raw data smoothing, inability to read large transitions, loss of accuracy in the periphery, and poor central coverage" and whose abstracts Conclusion is that "The clinician should be aware of the potential limitations of corneal topography when making clinical decisions."a