Wearing contact lenses in the pool poses a significant risk due to certain microorganisms that can withstand the chlorine. These resilient germs thrive in the warm, moist environments provided by contact lenses, essentially turning them into breeding grounds. To minimize the risk of pool water contaminating your lenses, always wear goggles if you choose to swim with contacts.

Among the most concerning of these microorganisms are acanthamoeba, which are ubiquitous in water bodies globally. Normally, they pose little threat, but when you swim with contact lenses, you grant these organisms far greater access to your eyes’ surfaces. In severe cases, acanthamoeba can infiltrate the cornea, leading to acanthamoeba keratitis — an infection that can result in permanent vision loss.

Beyond the microbial risks, contact lenses themselves can also be problematic in water. They are not designed for underwater use and may swell or tighten around the cornea, causing discomfort, or they may even slip out. For these reasons, it’s best to leave your contact lenses behind and opt for prescription goggles or glasses when engaging in water activities.