You can wear your lenses for most sports and activities. They rarely move or fall out. Plus, they don't fog up like glasses, and they give you better peripheral vision. If you swim, though, especially in lakes, avoid wearing your contacts in the water. Even with watertight goggles, you can get an eye infection from water, and your lenses can be hard to take out if they get wet. If you do accidentally wear them in the water, use saline or rewetting drops to loosen them and remove them as soon as possible. Then clean and disinfect them. If you do swim in contact lenses, it is best to use daily replacement lenses and throw them away after swimming. Hot tubs and lakes are the riskiest water sources for microbes.