 With glasses, we get to work in the smallest increments of vision correction, finer than we do typically with contact lenses and finer than would generally happen with any form of surgery. And Dr. Sam recommends the best optical materials, which cost less than you might expect. There are lots of other materials being sold at an upcharge that will not give you as good optics. And we do our best to keep the prices at a reasonable level so it won't be a deterrent for people getting their vision corrected.