Most wearers who have a strong prescription power have been stressed by their unattractive thick and heavy lenses. Besides, in these days, fashionable frames are made of plastic or metal thinner and lighter than lens itself and they become very popular recently. That is, thin and lightweight is also a trend in eyewear. High-index lenses are ophthalmic lenses which have been thinned down while bending light more efficiently so it enables people to wear a thinner and lighter than conventional lenses. And because DIO 1.60 & 1.67 % 1.74 are made of urethane based material, so it has bigger tensile strength and impact resistance from external shock.

High-index or hyper-index lenses are up to 20% thinner than conventional plastic lenses. If you want to wear fashionable frames like popular over-sized frame style but you have high prescription, high-index or hyper-index lenses will solve the problem. Your glasses will look aesthetically perfect with these high-index lenses.

With the lenses made of conventional material, you might feel discomfort caused by heavy weight. High-index lenses are available also in an aspheric or atoric design. So it will relieve the pressure on your nose.
Recommended to the people who have high myopia and hyperopia over 2.00 Diopter.