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Your eyes are unable to see energy above the blue end of the
spectrum - the ultra violet , but this light is dangerous to them
and to your skin.. Glass is relatively transparent to these rays
but the current plastic polycarbonate lenses block 100% of this
radiation or can be easily made to do so with dyes that still leave
them totally clear for vision. If you are wearing these either
for corrective vision or as safety glasses your are protected from
this whether the ultra violet originates from the sun or flame
sources. Tinted lenses reduce the intensity of light so vision is
better but glass ones do not necessarily protect against UV
exposure. Tinted glass welding lenses reduce the intensity but UV
protection is provided by the polycarbonte "protective" piece .
For the typical jewelry soldering with small flames you are
protected from UV with the proper plastic safety glasses or your
normal plastic polycarbonate vision"glasses". Optivisors have
glass lenses and provide no protection from UV by themselves but
will if used ion conjunction with polycarbonate safety or vision
correcting polycarbonate "glasses ". Infra red radiation - "heat"
is below the red end of the visible spectrum . Neither normal
glass or polycarbonate lenses provide much protection from intense
infra red radiation or "heat". Small soldering flames are not much
concern but looking into hot kilns or furnaces or the very intense
oxy fuel flames used by borosilicate glassworkers will cause
permanent damage .
As Jim Binnion suggests the best source for proper eye protection
for craftspeople is Aura lens:
http://www.auralens.com/
They will help you select the proper vision aids without the hype
and very often incorrect information from other sources.
Additional valuable information can be found at:
http://www.x-celoptical.com/
These people do not serve the direct market but provide a lot of
information on their site.
Jesse
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them about the wonderful array of supplies, services and products
you have to offer?
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