Deve is correct in saying how dark of a lens is purely subjective.
All the welding lenses block UV and that's the bad guy. You
need as much light as your old eyes ask for to see what your
doing, that varies with the individual. As we get older as I
mentioned earlier the old eyes start to get cloudy. Here a
little bit from Mayo about cataracts for the younger guys
that think they're never gonna have bad eye sight. The last
paragraph especially applies to what we've been talking
about---light that is.
"A cataract is a clouding of the normally clear lens of your
eye. For people who have cataracts, seeing through cloudy
lenses is a bit like looking through a frosty or fogged-up
window.
Clouded vision caused by cataracts can make it more difficult
to read, drive a car (especially at night) or see the
expression on a friend's face.
Most cataracts develop slowly and don't disturb your eyesight
early on. But with time, cataracts will eventually interfere
with your vision.
At first, stronger lighting and eyeglasses can help you deal
with cataracts. But if impaired vision interferes with your
usual activities, you might need cataract surgery. Fortunately,
cataract surgery is generally a safe, effective procedure."
DG
Last edited by Denny Graham; 10/06/2014 1:15 PM.
