» Mark J. Krawitz, M.D.
» Vincent J. Giuseffi, M.D.
» John F. Lane, M.D.
» Debra Firestone, M.D.
» Jasvinder Singh, M.D.
» Susan R. Carter, M.D.
» Matthew Gewirtz, M.D.
» Arthur L. Siegel, O.D.
» Myopia
» Hyperopia
» Astigmatism
» Presbyopia
» Cataract
» Glaucoma
» Macular Degeneration
» Diabetic Retinopathy
» Dry Eye Syndrome
» Flashes & Floaters
» Low Vision
» Lens Design
» Lens Materials
» Lens Treatments
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HARD RESIN (plastic)
Conventional hard resin lenses are half the weight of glass
lenses and can be tinted to almost any color and density. Hard resin lenses
are more easily
scratched than glass but can have an optional scratch protection applied. More
impact resistant than glass, hard resin lenses do not require tempering.
LIGHTER, THINNER LENSES
Modern technology has created lenses that bend light
differently so that stronger corrections are thinner than when made in conventional
materials.
Such lenses are called "high index" producing stronger corrections that are
more attractive because they are slimmer. Glass lenses are also available with
the slimming advantages of high index but are considerably heavier. High index
plastic uses less material so they are often lighter in weight. High index
lenses absorb all harmful UV light and can be tinted to any shade or color.
LENSES THAT DARKEN IN THE SUN
These are lenses that darken as you go from indoors
to outdoors. They are available in glass, hard resin and polycarbonate. Originally
made to darken
to a moderate shade, new versions are available that darken to a true sunglass.
Ask for a demonstration of these lenses.
POLYCARBONATE
Polycarbonate lenses are the most impact resistant lenses available
and are always the lens of choice for young people and active patients. Polycarbonate
lenses are high index and usually provide the lightest, most comfortable lenses.
They absorb all harmful UV light and can be made ultra thin because of their
unique strength.
GLASS
For years glass was the only lens material available and glass still
offers superior optics. Although the most scratch-resistant material, the primary
disadvantage of glass is its weight, generally twice that of hard resin.
Glass lenses are heat or chemically tempered to increase impact resistance.
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Hard Resin