What is Lens Index?The lens index refers to the index of refraction
(otherwise known as refractive index) of lens material for eyewear.
It is a relative measurement number that describes how efficiently
the material bends light. Light refraction will depend on how quick
light itself passes through the lens. Refractive IndexLens
materials are classified on their refractive index. This refractive
index is the ratio of the speed of light when it travels through
air to the speed of light when it passes through the lens material.
It is an indication of how much light is bent as it travels through
the lens. Light is refracted, or bent, at the front surface of the
lens, then again as it exits the lens.A denser material bends light
more, so not as much material is needed to achieve the same
refractive effect as a less dense material. Hence the lens can be
made thinner, and also lighter.With regular eyeglasses lenses, the
center of the glasses is thinner and the outer edges are thicker to
facilitate refraction which is what makes prescription glasses
work! High index lenses have a higher index of refraction than
regular lenses, which means they don't need to be as thick around
the edges to be effective.High-index lenses mean that the lens
itself can be both thinner and lighter. This allows your glasses to
be as fashionable and comfortable as possible. High-index lenses
are particularly beneficial if you have a strong eyeglass
prescription for nearsightedness, farsightedness, or astigmatism.
However, even those with a low eyeglass prescription can benefit
from high index lenses./* January 22, 2024 19:08:37
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