No, no and no. Not only can you not swim in them, but you can not expose your contact lenses to any type of water at all. This includes tap water, oceans, swimming pools, lakes, hot tubs, and even showers! Soft contact lenses absorb not only the water, but any viruses, bacteria, or other microbes that are living in the water. Although rare, an organism called Acanthamoeba which lives in impure water can attach itself to your contacts and cause your cornea to become extremely infected and inflamed and can cause permanent vision loss and/or a corneal transplant if not treated quickly and aggressively. A couple of weeks ago a young man from the UK shared his personal story of how he contracted Acanthamoeba – he initially thought he just scratched his eye putting in his contacts, but instead of getting better over time it got worse. Ultimately he was diagnosed with Acanthamoeba keratitis and even after months of different treatments and procedures he unfortunately lost the vision in his eye. The doctors concluded that he contracted the infection because he showered daily in his contact lenses. Although this is definitely a worse case scenario at the very least the water can cause your contacts to tighten up on your eye and create discomfort or can wash away your natural tears causing dry eyes. Waterproof well fitting swim goggles can be worn over contacts but an even safer option is to purchase a pair of prescription swim goggles to eliminate all risks of contamination.