Q: How bad is it for your eyes to open them under water?

A: In short, prolonged exposure to water can be irritating or dangerous in many ways. Contact lenses can be easily lost. Chlorine from pools can inflame the ocular surfaces. Freshwater itself can cause edema in the eye just from the lack of salinity. Water from hot tubs, outdoor freshwater and sea water can carry all sorts of infectious microorganisms. The human eye doesn’t focus well under water, so the vision is blurry. Try to use swim goggles or masks when you know you’ll be needing to see underwater.