How do PolyVue High Definition Aspheric lenses minimize spherical aberration?

In order for a soft contact lens to be effective in reducing spherical aberration caused by lens power and flexure on the eye, the amount of spherical-aberration-reducing curvature must vary with the power and thickness of the lens, and be compensated for lens flexure on the eye. PolyVue has incorporated aberration reduction geometry into all of its High Definition Aspheric lenses by using computerized ray-tracing programs and sophisticated ophthalmic instruments to determine the ideal aspheric curvature for each lens power and thickness in its “unflexed” state. This unique design results in improved visual acuity at all distances, as well as increased depth of field, reduced refractive astigmatism and improved contrast sensitivity. Overall, patients enjoy crisper, sharper, clearer vision than with conventional soft contact lenses. Clinical studies have also found PolyVue High Definition Aspheric lenses effective for early presbyopes.