Thank you for your question!
There is such a thing as high index prescription lenses. The use of high index lenses has grown tremendously over the past couple of years due to the high demand for sunglasses
that have more curve then what can be done with glass.
Information can be found on most of our pages regarding the differences between the lens materials.
•CR-39 Plastic (also known as hard resin) is overall cost-effective & most commonly used lens material. CR-39 is thinner and lighter than glass. Recommended sphere range is 0.00 - +/-8.00 and cylinder range is 0.00 - +/-2.00
•Polycarbonate is the most impact resistant lens available. Polycarbonate lenses are highly recommended for kids, sportsmen and military. This lens material is thinner & lighter than CR-39 or glass. It blocks UV rays. Anti-scratch coating is included. Recommended sphere range is +/- 2.00-8.00
•Aspheric Polycarbonate lenses feature the same properties as polycarbonate lenses, but they are recommended for plus (+) sphere prescriptions only
•High Index 1.60 (also known as HX 1.60) lenses are thinner & lighter than CR-39 or glass. Recommended sphere range is 0.00 - +/-15.00
•High Index 1.67 (also known as HX 1.67) lenses are thinner than High Index 1.60, CR-39 or glass. Recommended sphere range is 0.00 - +/-16.00
•Ultra High Index 1.74 (also known as HX 1.74) is the thinnest & lightest plastic material. AR coating is included, recommended sphere range is 0.00 - +/-18.00
•Glass lenses feature superior optical
quality and scratch resistance. Although glass is heavier and thicker than other lens materials. Recommended sphere range is 0.00 - +/- 3.00
Please keep in mind, that even with high index materials, some manufacturers still do not allow RX lenses to be made for their models. This can be because they have studied their frame and have not deemed high index materials to work with their sunglasses
and still honor your prescription
. If you are not seeing the ability to choose a high index material on our website, it will be because that model is not offered in high index.
I hope this helps.