..the other day i walked into lds just to kill some time and walked out carrying two steel tanks and a new mask (one of those days...)
when i've got home i looked up the mask on the manufacturer's page:
"The moment the fish feels the hunter’s eyes fixes on him and escapes.
The hunter hides his eyes to avoid this reaction in the fish. Ideal for open-water spearfishing on sigh"
i am not a spearfisher, so sorry if the above description is 100% true. but it sounds to me equivalent to saying that hunters should wear mirrored sunglasses to keep deer from running away from them.
(i still like the mask, but just when i bought it i thought the function of the tinted lenses is more along the lines of making the colors look better under water or.. err.. make diver look "cool" :-D
...not mentioning the fact that the lense is really mirrored, not just tinted so if i ever get panicky under water my fellow divers will have very tough time to find that out by looking into my eyes...