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Designer Sunglasses: What You Need To Know.
Content Provided By The American
Academy Of Opthalmology
A number of scientific studies
indicate that spending long hours in the sun
without eye protection can damage your eyes by
contributing to cataracts, macular degeneration,
and growths on the eye, including cancer. Based
on these studies, ophthalmologists recommend
that you wear 99% and above UV-absorbent
sunglasses whenever you're in
the sun for long periods of time.
When to wear sunglasses.
Sunglasses should be worn anytime
you are outdoors, particularly under these
circumstances:
during the summer,
when the level of ultraviolet radiation (UVA and
UVB) is at least three times higher than
winter; when at the beach or in the water; when
participating in winter sports, especially at
high altitudes;when using medications that can
cause photosentivity.
What to look for when purchasing
sunglasses.
Most sunglasses are designed to
protect our eyes from the sun's harmful effects.
Often the labels on sunglasses promise
protection from ultraviolet light and other
kinds of natural radiation. It is important to
know what kind of light you need to protect your
eyes from and what type of light is not
necessarily harmful.
*BLOCKS 99% OF ULTRAVIOLET RAYS:
You should always buy sunglasses
with this feature. Long-term exposure to
ultraviolet (UV) radiation in sunlight is linked
to eye disease. UVB radiation is considered more
dangerous to the eyes and skin than UVA
radiation.
Both plastic and glass lenses
absorb some UV light, but absorption can be
improved by adding chemicals to the lens
material during manufacturing or by applying
special lens coatings. Look for sunglasses that
block 99% or 100% of all UV light. Ssome
manufacturers' labels say "absorption up to
400nm." This is the same thing as 100%
absorption.
*GROUND AND POLISHED: Some nonprescription glasses are
ground and polished to improve the quality of
the lenses. Nnonprescription lenses that are not
ground and polished will not hurt your eyes. You
do want to make sure that the lenses you buy are
made properly. To judge the quality of
nonprescription sunglasses, look at something
with a rectangular pattern, such as floor tile.
Hold the glasses at a comfortable distance and
cover one eye. Move the glasses slowly from side
to side, then up and down. If the lines stay
straight, the lenses are fine. If the lines
wiggle, especially in the center of the lens,
try another pair.
*IMPACT RESISTANT: All sunglasses must meet impact
standards set by the Federal Food and Drug
Administration (FDA) for safety. No lens is
truly unbreakable, but plastic lenses are less
likely than glass lenses to shatter when hit by
a ball or stone. Most nonprescription sunglass
lenses are plastic. Polycarbonate plastic, used
in many sports sunglasses, is especially tough,
but it scratches easily. If you buy
polycarbonate lenses, look for ones with
scratch-resistant coatings.
*POLARIZED: Polarized lenses cut reflected
glare—sunlight that bounces off smooth surfaces
like pavement or water. They can be particularly
useful for driving and fishing. Polarization has
nothing to do with UV light absorption, but many
polarized lenses are now combined with a
UV-blocking substance. Check the label to make
sure the lenses provide maximum protection.
*LENS DARKNESS: A medium lens is good for
day-to-day wear, but if you use the glasses for
very bright conditions, choose a darker lens.
The color and the degree of darkness do not tell
you anything about the lenses' ability to block
light.
*PHOTO CHROMIC: A photo chromic glass lens
automatically darkens in bright light and
becomes lighter in low light. Most of the
darkening takes place in about half a minute,
while the lightening takes about five minutes.
Photo chromic lenses come in a uniform or
gradient tint. Although photo chromic lenses may
be good UV-absorbent sunglasses (again, the
label must state this benefit), it takes time
for them to adjust to different light
conditions.
*WRAPAROUND STYLE: Wraparound glasses are shaped to
keep light from shining around the frames and
into your eyes. Studies have shown that enough
UV rays enter around ordinary eyeglass frames to
reduce the benefits of protective lenses.
Large-framed wraparound sunglasses can protect
your eyes from all angles.
*GRADIENT LENSES: Gradient lenses are permanently
shaded from top to bottom or from top and bottom
toward the middle. Single-gradient lenses (dark
on top and lighter on the bottom) can cut glare
from the sky but allow you to see clearly below.
They are useful for driving because they don't
dim your view of the dashboard. They're not as
good, however, at reducing glare in snowy
surroundings or at the beach. Double-gradient
lenses (dark on top and bottom and lighter in
the middle) may be better for sports where light
reflects up off the water or snow, such as
sailing or skiing. Double-gradient lenses are
not recommended for driving because they make
the dashboard appear dim.
*MIRROR-COATED:
Mirror finishes are thin layers
of various metallic coatings on an ordinary
lens. Although they do reduce the amount of
visible light entering your eyes, do not assume
they will fully protect you against UV
radiation. blocks 90% of infrared rays. Infrared
wavelengths are invisible and produce heat.
Sunlight has low levels of infrared rays, and
the eye tolerates infrared well. Some sunglass
manufacturers make health claims for their
products based on infrared protection, but
research has not shown a close connection
between eye disease and infrared rays.
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Our sunglasses are up to 60% cheaper than the
ones you'd find at your local optical store. We
also offer prescription sun glasses, made by our
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styles seen everywhere from the runways to the
streets. Get the look you want and the UV
protection you need with discount sunglasses
from any designer in the world. If you don't
find your favorite designer on our website,
we'll special order it for you. Just let us know
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