The Hilco Prescription Swimming Goggles provide corrective powers for swimmers with near or far-sightedness contact lenses aren't needed while you swim (which isn't healthy for your eyes). They also provide 100% UVA & UVB protection for outdoor swimming & high performance anti-fog treatment. For Myopia (short-sightedness), select powers from -1.0 to -8.0 & Hyperopia (far-sightedness), select from +1.0 to +8.0. Some assembly required.