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Old 11-28-2013, 11:52 AM
crystallographic crystallographic is offline
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Adding to: "vision magnification":

The eyes' need for light doubles after the age of 40 and doubles again at 50, and doubles again ... etc. So, adding a weld-darkening filter in front of your eyes - after the age of 40 - the need for vision magnification goes up. Over-magnification might be a necessary consideration when welding. I use 1.5D cheaters in my headgear and I wear 1.5D readers down my nose underneath the goggle, so that if I need more clarity I can tilt my vision down through the added magnification provided by the readers. Sort of like using close-up lenses on the camera - stacking the +1, +2, and +3 lenses in different combinations for the view required - you can vary your own welding magnification when needed, as your available light varies.

(This is very "on-topic" if you find that you are using your eyes when doing metal work.)
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