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Manual reaction time to a 2 c/° grating. Nonamblyopic (open symbols) and amblyopic eyes (filled symbols) of a strabismic anisometrope. The curves are best-fitting power functions. Data from figure 2 in Levi, Harwerth, and Manny (1979). Top: Data plotted as a function of contrast. Bottom: Data plotted a function of contrast in multiples of threshold. Arrows point to asymptotes estimated from fitted power functions.
