High Index Prescription Lenses
The skinny on high index lensesWhat does an index have to do with prescription lenses?
The index in high index lenses refers to the index of refraction of the material that the lens is made of. Index of refraction is a calculated number that refers to a materials ability to bend light. The higher the index of refraction, the greater is the ability of that material to bend light.
Light must be bent by a lens in order for light to be focused. With a higher index of refraction there needs to be less material in the lens in order for light to be brought into focus. What this means, in prescription lenses, is that the higher the index of refraction of a lens the thinner and lighter the lens will become. Lighter lenses are more comfortable to wear. Thinner lenses tend to be more appealing with less of the “coke bottle” effect especially in higher powered eyeglass lens prescriptions.
Labels: Prescription Lenses
posted by Dr Becker @ 8:11 PM
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