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Search: Posts Made By: crystallographic
Forum: Shop Safety 11-28-2013, 11:52 AM
Replies: 6
Views: 10,912
Posted By crystallographic
Adding to: "vision magnification": The eyes'...

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...
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