Whats the difference between 1.6 and 1.74 lenses?

The real winners are materials such as for example Trivex, CR-39 and Crown Glass. Generally speaking, high-index is best suited for higher prescriptions. Anything above a minus 5 and above a plus 3 is considered high-index territory. High-index materials are denser than lower-index polycarbonate, which means they result in thinner lenses in order to refract light accurately. The concept of double concave lenses is to achieve thinner lenses for high minus powers.

Polycarbonate lenses were initially used for safety glasses and today this material is actively used in making kids glasses, sports glasses and for nearly every prescription. 1.59 index offers optical clarity and also 100% UV protection. High-index lenses are especially helpful if you have a solid eyeglass prescription for nearsightedness, farsightedness or astigmatism. The difference high-index lenses make in turning thick glasses to thin glasses could be very dramatic should you have a strong prescription. While both regular and high index lenses function in the same way, high index lenses are made to bend light better — resulting in thinner and lighter lenses. Payne’s high-index lenses are offered at a realistic price with value-adds such as anti-scratch, anti-reflective, and 100% UV protection.

For You? & Choosing

A 1.56 mid-index lens will still require full-rim glasses but can be useful for athletes during physical exercise. Simply put, assuming you have high index lenses, they will be thinner. Conversely, if your prescription glasses are fitted with lower lens index material, they’ll be thicker.

• The vast price range is set partly by the eyewear retailer or brand you choose but can be blamed mostly on the exponentially increasing costs of higher index lenses.
• Understanding these numbers and how they relate to your eyesight can be an important part of selecting the most appropriate lenses for you.
• Therefore, people wearing thick lenses should choose round frames or oval frames to lessen such distortion as much as possible.
• In layman’s terms, this means that they have a larger capability to bend light rays and for that reason can be thinner around the edges, unlike traditional lenses.
• The refractive index of prescription lenses extends from 1.5 standard index to at least one 1.74 high index.