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EYEGLASSES
Below you will find information about eyeglass
options. At Clear View Eye Clinic, we feel you should be
educated on these options so that you can better decide
which options fit your visual needs. Of course, our staff
is always available to answer questions and make personalized
recommendations of what will be best for you.
Lens Materials
| Glass |
Oldest lens material
(although archeological findings have discovered emerald
and ruby lenses in ancient cultures- we'll just stick
to modern times). Has superior optical qualities (clarity)
to plastic lenses, yet are very heavy and are a safety
concern due to shattering into small sharp fragments
when impacted.
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| Basic Plastic (CR-39) |
Like the name implies, these lenses
are, well, basic. The cheapest lens available, but prone
to shattering upon impact, and chipping when placed
into a drill-mount or semi-rimpless frame. |
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| Polycarbonate |
The most impact-resistant material
available- these lenses exceed ANSI safety standards
at less than 1/3 the required thickness! Polycarbonate
lenses also have the added benefit of being lighter
and thinner than basic plastic lenses. Recommended for
safety, sports and children's glasses. |
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| Trivex |
Trivex has optical qualities (degree
of clarity) nearly identical to glass. Due to manufacturing
processes, it is even less likely to crack than polycarbonate,
although it is less impact resistant (more prone to
shattering than polycarbonate, yet less likely to crack?
strange but true- anyways, both are much safer than
basic plastic or glass). Recommended for drill-mounted
frames. |
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| Hi-Index |
Hi-index lenses fall between basic
plastic and polycarbonate in their degree of safety,
but offer the benefit of creating the thinnest lens
possible. Hi-Index lenses include 1.60, 1.67, 1.70,
and 1.74. Basically the higher the number, the thinner
the lens (but also the higher the cost). |
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