All,
I was just re-reading a thread about eyeglasses and came across a contradiction that bugs me. An eye doc posted that photochromatic lens won't work under RV canopies beacuse the canopies block the UV rays that activate them. Other reputable posters said unequivocally that their photochromatic lens did darken under the canopy. The confusion makes me wonder if:
1) photochromatic lens are not activated by UV rays but rather some other mechanism, or
2) our canopies do not block UV rays (something I was told they do by a reputable source).
Any thoughts on the apparent contradiction?
Thanks,
I was just re-reading a thread about eyeglasses and came across a contradiction that bugs me. An eye doc posted that photochromatic lens won't work under RV canopies beacuse the canopies block the UV rays that activate them. Other reputable posters said unequivocally that their photochromatic lens did darken under the canopy. The confusion makes me wonder if:
1) photochromatic lens are not activated by UV rays but rather some other mechanism, or
2) our canopies do not block UV rays (something I was told they do by a reputable source).
Any thoughts on the apparent contradiction?
Thanks,