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- Mar 11, 2013
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according tho this, OD 2 is the minimum for 100mW of 532, but I agree that if more powerful units (purchased by your parents until you are 18) are in your future, better glasses, at least OD 4 are a better investment
https://www.lia.org/evaluator/od.php
https://www.lia.org/evaluator/od.php