What characteristic does higher index of refraction offer in lens design?

A higher index of refraction in lens design allows for a thinner edge profile. This is because materials with a higher refractive index can bend light more effectively than those with a lower index. As a result, lenses made from these high-index materials can achieve the same optical power with less thickness.

In practical terms, this means that lenses can be constructed to be lighter and more aesthetically pleasing while maintaining the same degree of correction for vision. By reducing the thickness, particularly at the edges, high-index lenses can enhance the overall comfort for the wearer and minimize the bulk typically associated with prescription eyewear.