What is an aspheric surface?

surfaces of a lens system aspheric; i.e., with the variable curvature of a paraboloid or other surface rather than the constant curvature of a spherical one.

What is aspheric lenses for eyeglasses?

Advanced optical design technology allows aspheric eyeglass lenses to be made with flatter curves than conventional lenses, giving them a slimmer, more attractive profile. Conventional lenses have a front surface that is spherical, meaning it has the same curve across its entire surface, much like a baseball.

When should I use aspheric lenses?

The long answer: Individuals with strong farsighted prescriptions should choose aspheric lenses if they are concerned about the bulging appearance of the lens or the magnification of their eye. But aspheric lenses aren’t just in prescription eyeglasses, they are available in reading glasses, too!

What is the thinnest glasses lens available?

1.74 index lenses
Answer: 1.74 index lenses are the thinnest eyeglass lenses for high prescriptions. These ultra-light lenses are the thinnest kind developed yet, and accommodate the highest prescriptions possible. They’re much thinner and lighter compared to 1.67 index lenses, and offer a certain level of cosmetic value too.

Are all 1.67 lenses Aspheric?

Aspheric lenses are more prevalent in high indexes such as 1.61, 1.67 and 1.74 designed to reduce thickness for strong prescriptions. Aspheric lenses are commonly available in lightweight materials such as polycarbonate and Trivex, but can also be made from CR39 (regular lens plastic.)

What is the difference between aspheric and spherical lenses?

Conventional lenses have a front surface that is spherical, meaning it has the same curve across its entire surface, much like a baseball. Aspheric lenses, on the other hand, have a more complex front surface that gradually changes in curvature from the center of the lens out to the edge.