1). The highest impact resistance among other index lenses
2). The most easily tinted than other index lenses, such as 1.56, 1.61, 1.67, 1.74 and 1.59 pc.
3). The highest transmittance as compared with middle index lenses and high index lenses.
4). The highest ABBE value(57) providing the most comfortable visual experience than other index lenses.
5). The most reliable and consistent lens product physically and optically.