The lens design depends on the type of correction you need and your daily activities.
Single vision lenses
For just one prescription, distributing focus evenly over the entire surface of the lens.
For people who have presbyopia and need various correction areas providing clear, relaxed vision at all distances.
For people whose visual tasks are based predominantly around near and intermediate vision.
Coating adds specific features to the lenses, making them anti-reflective, scratch-resistant, colored or contrast-enhancing. The chosen features enable the lenses to better suit your needs and preferences.
Even lens material is a matter of choice since different materials will affect strength, weight and aesthetical impact. The higher refractive index of the material, the thinner and lighter the lens will be.