What is a common characteristic of high-index lenses?

High-index lenses are designed to have a higher refractive index than standard lenses, which means they can bend light more efficiently. This characteristic allows them to be crafted to a thinner profile while still providing the same level of vision correction. As a result, high-index lenses are generally much lighter than their lower-index counterparts, making them more comfortable for long-term wear, especially for individuals with higher prescriptions. This combination of being thinner and lighter provides aesthetic benefits, as thicker lenses can add bulk to eyeglasses and may be less appealing to wear.

The other possibilities do not accurately describe high-index lenses. They are not necessarily thicker or heavier; in fact, they are specifically designed to address issues of thickness. Regarding durability, high-index lenses can be quite durable, depending on the materials used, and while many high-index lenses are made of plastic materials, they can also be available in polycarbonate and other materials.