Buying eyeglass lenses requires making decisions about the design
of the lenses, the lens material, and any coatings you may want
applied to the lens. A good place to start is an overview of eyeglass
lens options from the Opticians Association of America.
Lens Designs
Lens design is a decision that's probably made for you. Most
people get either single-vision lenses (to correct nearsightedness,
for example) or bifocal lenses. Bifocals and other multifocals
correct more than one vision problem, such as nearsightedness and
presbyopia (an age-related inability to focus on close work).
Many people who require bifocals or multifocals opt for
progressive lenses. Progressives have a smooth progression of
optical power, enabling you to see at intermediate distances as well
as near and far. Another advantage is that they don't have bifocal
lines, which can be unattractive and a tell-tale sign of age! Still
others prefer reading glasses; the market has grown in leaps and
bounds now that baby-boomers are wearing them and a wide variety of
styles is available.
Lens Materials
Three factors will drive your decision on eyeglass lens
materials: appearance, function and safety.
To look good, you'll want your lenses as thin as possible. An
excellent choice is high-index lenses. People with strong
prescriptions love them because not only do they get rid of the
hated "Coke-bottle" appearance, but they're also lighter
to wear. No more sore nose!
Tired of the hassle of switching between your eye glasses and your
sunglasses? Maybe you wrestle with sunglass clip-ons instead. You
might want to look into photochromic lenses, which automatically
darken when you go outdoors and return to normal when you go back
in. Think they don't work quickly enough? Actually, today's
photochromic lenses are way faster than the ones from years back.
When safety is an issue, you must use polycarbonate: it is an
extremely impact-resistant material, so it's ideal for sports and
for kids' eye glasses. Read why polycarbonate is the safest eyeglass
lens material. The American Academy of Ophthalmology has information
about the best ways to prevent eye injuries during sports. You can
also get information from Prevent Blindness America.
Lens Coatings
| Coatings
can be for fashion and/or function. Antireflective coatings
are both: they help you to see through the lenses better and
keep glare from obscuring your beautiful eyes from others.
Scratch-resistant coatings are particularly handy for plastic
lenses: while plastic is nice and light, it's more
scratch-prone than glass. UV coating protects your eyes from
the sun's harmful rays; you can get it in both tinted and
clear lenses. Fashionable mirror coatings come in many colors
and prevent people from seeing your eyes.
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