Ultra violet, or UV,
rays are wavelengths of light that are
not visible to the human eye. There are
3 kinds of UV rays: UVA, UVB, and UVC.
UVA induces tanning.
UVB causes sunburn, blistering and potentially,
skin cancer. UVC is normally filtered
by the earth’s atmosphere so it
shouldn't cause any problems for people.
Most people already
know that UV rays cause sunburn and are
pretty good about protecting themselves.
People are not so careful about protecting
their eyes from harmful UV rays. Check
before you buy that sunglasses give 100%
protection against the most harmful UVB
rays and at least 99% protection from
The Blue problem.
It turns out that
the shorter blue light waves causes the
most visibility problems. The shorter
blue light waves can’t be properly
focused inside your eye. At times they
focus in the front of your retina, causing
"blue blur". This blue blur
causes eyestrain and fatigue.
Blue light waves are
also responsible for a problem known as
"veiling glare". Veiling glare
occurs when blue light scatters off dust
and moisture particles in the atmosphere.
It’s most common in fog, rain, snow
and overcast conditions. Lenses that selectively
filter out most of the blue light waves
have the effect of reducing glare, increasing
contrast and giving the wearer a clearer
sharper image. It is important not to
block all the blue light, as this would
distort the colours you see through the
lens. You need some blue light as well
as green, yellow and red light to keep
the colours balanced and natural looking.
You can have sunglasses
made up with your prescription which is
much more convenient than Clip-on's.
Should you require
any further information please do not
hesitate to contact us, using our online