Wrong again Mooron. Subs have viewing ports not lenses unless the are
concave or convex and reshape light transmitted thru them. .

Only reason sunglasses have Lenses is because they are a rip off of the
proper name of perscription lenses used in standard eye glasses that
predate sunglasses. The proper terms is sunglasses or filters, not
sunlenses.

You should try learning before spouting off.

Joe