Pentax Single Vision comes in 3 designs:
Pentax Single Vision (SV) is a range of contemporary lenses that is designed for urban professionals to cater to varying degrees of refractive errors. With thinner lens, user can enjoy a natural view that feels comfortable and stylish at the same time.
Pentax AS and Pentax DAS HD suit users with moderate to high level of refractive errors. Not only is Pentax SV aspherical range of lenses is thinner and flatter, it also reduces distortion to provide user with a crystal clear view and wider range of vision compared to conventional spherical lens.