Resistant Coatings - recommended to
protect lenses from
everyday wear-and-tear. FREE!
Included on all lenses. When
a spectacle lens becomes scratched, it can impair vision through the
lens and present an unattractive appearance. Scratch resistant coating
may be applied to both surfaces of a lens to help protect against
scratches caused by everyday use. This not only increases the
durability of the lens, but also protects your investment.
"Scratch-resistance" does not equal "scratch-proof". Because of this,
it is important to handle your glasses with care and always place them
in a proper case when not in use.
Coatings - Reduce both
external and internal reflections that occur as light passes through a
lens. These reflections are often annoying and are not cosmetically
appealing External reflections on the front surface of
the lens can hide a patients eyes. Internal reflections can reduce
visual acuity. Backside reflections can cause reflections of your own
eye. AR coating will almost eliminate both of these
reflections by increasing light transmission.
AR coatings consist of several microscopic layers of inorganic
materials usually applied to the front and back lens surfaces. AR
coatings sometimes have a hint of residual color, often a shade of
green, depending on the individual manufactures formula.
AR coated lenses also have varying degrees of quality depending upon
the number of layers of AR and the base hard coat of the lens. The
newest developments with regards to the quality of an AR coating are
the oleophobic (oil repelling) and or hydrophobic (water repelling)
properties of the AR, both of which keep AR coated lenses cleaner and
help them to last longer.
(ultraviolet) Coatings - UV
radiation consists of invisible rays from the sun. There are three
types of UV radiation: UVA, UVB and UVC. UVC rays do not pose any
threat, as they are absorbed by the ozone layer. However, exposure to
UVA and UVB rays can have adverse effects on your eyes and vision.
Short- and long-term exposure to these dangerous rays can cause
significant damage damage.
Short-Term Effects of UV Radiation
If you are exposed, unprotected, to excessive amounts of UV radiation
over a short period of time, you are likely to experience an effect
called photokeratitis. Photokeratitis is an inflammation of the cornea
caused by a brief exposure to UV radiation, usually when combined with
cold wind and snow. Like a "sunburn of the eye", it may be painful and
may create symptoms including red eyes, a foreign body sensation or
gritty feeling in the eyes, extreme sensitivity to light and excessive
tearing. Fortunately, this is usually temporary and rarely causes
permanent damage to the eyes.
Long-Term Effects of UV Radiation
Long-term exposure to UV radiation can be more serious. Scientific
studies and research growing out of the U.S. space program have shown
that exposure to small amounts of UV radiation over a period of many
years may increase the chance of developing a cataract, and may cause
damage to the retina, the nerve-rich lining of the eye that is used for
seeing. This damage to the retina is usually not reversible. Cumulative
damage of repeated exposure may contribute to chronic eye disease, as
well as increase the risk of developing skin cancer around the eyelids.
Long-term exposure to UV light is also a risk factor in the development
of pterygium (a growth that invades the corner of the eyes) and
pinguecula (a yellowish, slightly raised lesion that forms on the
surface tissue of the white part of your eye.)
Special coatings can be applied to lenses that do not inherently block
UV rays. Glass or Plastic lenses must be treated to provide UV
protection to 380nm. All Polycarbonate lenses provide this protection.
Tints - can be applied to a lens in varying intensities and colors.
Intensities of tint are represented by the percentage of light absorbed
by the tint, Grey is the most common color followed by Brown. A rainbow
of colors are available including Blue, Yellow, Rose and Green. Tinted
lenses are available in solid and gradient.
called “comfort” lenses, photo chromic lenses
darken and lighten according to light exposure. If the wearer is in the
sun, photo chromics darken, if indoors, the lenses are light. Photo
chromic lenses are available in virtually all lens materials and lens
Polarized lenses –
are the top pick for eliminating glare. Hunters,
fishermen, golfers, and drivers are a few who benefit from polarized
lens’ glare-cutting properties. Any surface can create glare
in sunlight, including water, sand, snow, windows, vehicles, and
buildings. Polarization eases eye stress and fatigue in the sun, and
comes in Gray or Brown
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