1/1/2011
All Harken sunglass lenses block 100% of UVA, UVB and UVC
rays, 90 to 95% of short wave blue light, and absorb 99.9% of
reflected glare. Contoured lenses eliminate distortion.
Injection-Molded Polarized Polycarbonate
Lens: Anti-reflective coating on lens interior
reduces "ghost images". Hydrophobic coating facilitates cleaning,
reduces water-drop scarring, and salt and dirt build-up.
Borosilicate Polarized Glass
Lens: Opthalmic-grade borosilicate glass provides
maximum clarity and optical resolution. Lenses are hand aligned to
ensure maximum polarizing efficiency. Durable, scratch and shatter
resistant.
Polarized Film
At the center of a polarized lens is a film
that absorbs glare. The polarizing film's dye content and density
determine efficiency i.e. a higher dye density has greater
polarizing efficiency. The film is locked between the lens layers
so they can't delaminate. Harken lenses block 99.9% of horizontal
glare.
Lens Color
The eye can't focus all colors on the retina surface and will focus
blue-light in front of the retina. Large amounts of blue light
(found on the water) make objects appear blurred (chromatic
aberration) by dominating the other colors. Shades of brown in your
sunglass lens neutralize these visually distorting effects. Harken
sunglasses offer different levels of blue light absorption: amber
for sunny weather or blue-light absorbing rose lenses for overcast
conditions.
100% UV-Ray Protection
UVA - is the most abundant, but least intense
invisible light. A majority of UVA rays pass through the cornea and
are absorbed by the lens. Long-term UVA damage wears down the lens.
Over time, the lens weakens and becomes susceptible to the harmful
effects of UVB and UVC.
UVB - is in the mid-region of invisible light
and is more intense then UVA. A majority of the UVB rays are
absorbed by the cornea, but some pass through to the lens, damaging
the cornea. The cornea is the fastest healing organ in our body and
can repair itself. However, the lens cannot. Any damage to the lens
is irreparable.
UVC - The ozone layer filters all UVC, but
with holes appearing in the ozone layer invisible light can pass
through. Too much exposure to UVC causes cataracts and skin
cancer.
Anti-Reflective Coating
When light passes through an uncoated lens,
approximately 4% reflects off the surface. Only 96% of the incident
light is transmitted.
An anti-reflective coating increases lens transparency and
resolution, and decreases reflections (ghost images) typically
found in sunglass lenses. The anti-reflective coating-an extremely
thin, invisible layer of metal-is deposited in a vacuum on the back
surface of the lens.
Hydrophobic Coating
The final layer on a Harken lens is a hydrophobic
coating. This coating bonds to the anti-reflective coating and
helps prevent water buildup and salt deposits on the lens surface.
When water dries on a lens without a hydrophobic coating, these
deposits are difficult to remove-a major drawback of polycarbonate
lenses with only a scratch-resistant and anti-reflective
coating.
The coating process uses a chemical vapor deposition method. The
coating protects lenses from water-drop scarring, dirt, and
facilitates cleaning. Fingerprints can be easily wiped
off.
Distortion-Free Lens Shape
Harken's lenses are tapered to eliminate the
distortion often found in other wrap sunglasses. Light is correctly
directed to the center of the eye by tapering the lens thickness
and by de-centering the cut of the lens so the optical center lies
directly in front of the eye. Light travels directly to the eye
regardless of the angle it enters the lens.
