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Yes post hoc definitely.
And false dichotomy too because instead of saying "dont use so-low" author says either use higher priced glasses or no glasses. There could be cheap glasses from other manufacturers that are as effective as expensive ones.
I think another point is unwarranted generalization. Study is restricted to sunny regions but conclusion is drawn on "anyone concerned about eye damage from the Sun"
We can also question the source of study. It need not be from independent body. May be competitor's biased campaign.
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