Why water is a problem
Acanthamoeba and Pseudomonas survive in water and adhere to lens material. Rinsing a lens with tap water or swimming in it introduces them directly. Acanthamoeba keratitis is rare but severe and hard to treat.
Pools and hot tubs
Chlorine does not sterilise. Hot tubs are worse because the water is warm and the bacterial load is higher.
Lakes, rivers and the sea
Highest risk. Avoid entirely with lenses, or use daily disposables and discard them immediately after.
If you must swim
Use tight-fitting goggles, choose daily disposable lenses and throw them away straight after. Never reuse a lens that has been in water.
After swimming
Rinse the case with fresh solution, not water, and do not put the same lens back in.
Frequently Asked Questions
Can I swim with goggles over contacts?
Goggles reduce but do not eliminate the risk, because water can still enter if they leak.
What about showering?
Same principle. Keep the eyes closed and avoid water on the face while wearing lenses.
Can I use a lens after it has been in water?
No. Discard it.
