I still somewhat disagree...
"Flat" glasses typically don't demonstrate any prism error (or imbalance), even if plano. But a 22-26 degree pair of wrap eyewear (most sports styles), even if plano, would manifest base out prism that would exceed our current ANSI tolerance. So an observer would see prism in this case...without being "prescribed". By allowing standards that would pass an error such as this is unaccetable, IMHO.
In fact, most makers of premium sports eyewear (such as Oakley), trumpet the fact that many competing models demonstrate "unwanted" prism...a result of the absence of a proper amount of *compensating* base in being present. This results is a base-out error.
In the end, I feel it is our current refractive paradigm that is outdated, not ANSI...
Barry
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