What are High-Index Lenses? - Thinner, Lighter, Flatter.
A high-index lens is a lens that has a higher “index” of refraction. This means it
has a greater ability to bend light rays to provide clear vision for people with
stronger prescriptions. But that’s the technical terminology. What do high-index
lenses mean for wearers?
Thinner, lighter, flatter and more visually appealing, that’s what! High-index lenses are
manufactured to be thinner at the edges of the lens and lighter in weight
overall.
A high-index lens is a good option for people who have strong prescriptions for
myopia—commonly called “nearsightedness” due to a difficulty in focusing on far
objects. A high-index lens can bend light rays more, while using less material
in lenses created for both nearsighted and farsighted people (hyperopia).
No more 'coke-bottle' glasses.
In times past, strong prescriptions meant thicker, heavier lenses, giving some a
“glass bottle” appearance. But now, with high-index lenses available in thinner,
lightweight plastic, lens wearers with
stronger prescriptions can get more attractive, yet equally effective, lens
products. Because high-index lenses bend light more, anti-reflective (AR)
treatment is often recommended as an add-on for optimum clarity of vision.
For better comfort, better vision and improved cosmetic appeal, people with
strong prescriptions can’t beat high-index lenses.