What is the highest number of shortsightedness in diopters (sphere) and the highest diopter of astigmatism (cylinder)?
There is a better way to think about the issue of "how bad can astigmatism and/or myopia (shortsightedness) be?" The median (half being worse and half being better) degree of myopia in North America is about -3 Diopters. [This is based on contact lens sales.] High myopia is roughly...
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06 Nov 2022