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The whole subject of optometry could almost be a subject in school :- ) but just real quick Dr. B... Johnson stated that his vision tested as 20/10 after the Lasik.
I'm guessing you could give a contacts prescription that was 20/10, 20/5 or whatever magnification you wanted to... without reading the study above, I assume that the doctors gave whatever prescription they judged best? It wasn't controlled to study a given prescription of 20/20 or whatever?
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My first thought would be, if my natural eyes could be corrected to 20/10, that would be much preferable to 20/10 with contacts, just because the contacts move around in your eyes, could give different refractions at changing angles and so forth...
But, as you say, this study got to the bottom line and measured end performance, so if well-designed and with a high coefficient of confidence, then sure...