1-56 Index Lenses with a 1.56 index are considered the most cost effective lens on the market. They possess 100% UV protection and are 22% thinner than CR-39 lenses. They are available with aspheric technology and are not recommended for a rimless drill mount due to its weak nature.

Material: MR7 Refraction index Nd=1.56 1.56 middle index lenses are one of the most popular lenses all over the world. This determines that 1.56 single vision lenses have the most outstanding optical features:

1. Thickness: In the same diopters, 1.56 lenses will be thinner than CR39 1.499 lenses. As the increase in diopters, the difference will be bigger.

2. Visual Effect: Compared with high index lenses, 1.56 lenses have higher ABBE value, can provide a more comfortable visual experience.