1.74 High Index Lenses
Optical lenses are made of plastic, polycarbonate or glass. When one has high power (over 4.00) or high strength of cylinder (over 3.00), the lenses become very thick and bulky. High-index lenses solve that problem. High-index lenses are made of a material with higher refractive index. This makes them thinner than normal lenses for any power. One can get high-index lenses for any prescription but are recommended for high prescriptions.
The 1.74 high-index lens material is the thinnest lens available. It is a great choice for very high prescriptions (more than 7.00 sphere and above 4.00 cylinder). The lenses are the thinnest and lightest polycarbonate lenses. They are not available in plastic. The 1.74 high-index lenses are not recommended for rimless frames. You can choose to add a variety of coatings and treatments to the lenses for anti-reflection, smudge-resistance and UV protection. The lenses are available in tinted polarized and transition options.
Worried about the harmful blue-light? 1.74 high-index lenses are also available in the revolutionary blue-blocking technology.