All UVShield filters absorb ultraviolet radiation to 400nm-radiation
that is causally related to cataract formation. Many UVShield
filters absorb energy through the blue light spectrum (400nm-500nm)
to provide a more soothing, comfortable viewing experience.
This visible spectrum absorption (commonly known as Blue Blocker
Protection) protects the retina against long-term exposure
to high-energy wavelengths, which are increasingly associated
with the deterioration of the center of the retina and may
contribute to the degenerative process known as macular degeneration.
MD Support, a leading low vision consumer organization,
recommends amber, yellow or orange lenses for best protection
of the retina from blue light wavelengths. For more information
on the blue light hazard, see www.mdsupport.org/library/hazard.html
"Blue Blocker Protection" doesn't simply protect
the eyes for the long-term; it also affords immediate visual
benefits, most notably cutting glare and enhancing contrast.
Technically, glare relief is achieved by filtering the short-to-medium
wavelengths of the visible spectrum (blue-green-yellow), which
scatter within the opacities in the ocular media, and allowing
only the longer wavelengths to reach the retina. UVShield
"Blue-Blockers," including the amber, yellow, plum
and orange filters, cut the glare from reflected surfaces
(snow, water, sidewalks, windshields and store windows) and
make for more comfortable experiences for both recreational
activities, such as boating, fishing, golfing, and daily activities,
including shopping, driving and working in the yard.
Contrast enhancement is also a function of the "Blue
Blocker" effect of reducing the shorter wavelengths.
"Blue Blockers" have the additional benefit of highlighting
visual distinction and enhancing contrast, which makes for
a more comfortable experience, whether for driving and reading
street signs, or for enjoying the outdoors.