Lens Materials

Refractive Index The refractive index of a lens material indicates how much the material will refract or bend light as it enters the material from air, by comparing the speed of light in a given material to the speed of light in air. The higher the index number of a...

Video: Lens Material Drop Tests

The following videos show the results of drop tests perfomed by Younger Optics on CR-39, Spectralite, 1.60, Polycarbonate, and Trivex. All tests were perfomed using a 500g missile with a 1 mm point. The lenses tested were all front-side coated with a center thickness...

Basic Lens Styles

Single Vision Single vision lenses, as the name suggests, correct a single refractive error with a single focal length. When a myopic or hyperopic refractive error exists, spectacles are required to correct vision. Minus powered single vision lenses are used to...

Trivex vs. Polycarbonate

Even though Trivex has been available for a while now, there is still much debate and confusion about how Trivex and polycarbonate stack up against one another. We'll lay out the facts and attempt to put the question to rest. Polycarbonate Born from the space race in...

Focus on Progressive Lenses

It Doesn't Last Forever Eventually it gets everyone. That point in a patient's life comes when no matter how perfect their vision may have been as a young adult, they begin to notice changes. The newspaper becomes more difficult to focus or the fine print on...

Focus on Coatings

Lens Coatings - Advancing the Utility of Spectacle Lenses All optical materials, no matter how advanced or well-suited for a patient's needs, suffer from innate shortcomings specific to the lenses chemical makeup. Where crown glass is unquestionably superior in...
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