Glass or Plastic Lenses? Why Almost No One Wears Glass Lenses Now, and Who Still Might
26 October 2026
07:58
I’ll cut straight to it: you should not swim wearing contact lenses. Not in the pool, not in the sea, not in a loch, not in a hot tub. I know most people do it anyway, and I know nothing terrible has happened to most of them. But the risk is real, and the potential consequence is serious enough that it’s worth understanding why.
Water – including chlorinated pool water, fresh water, and seawater – contains microorganisms that can adhere to the surface of a contact lens and become trapped against your cornea. The most dangerous is Acanthamoeba, a single-celled organism found in tap water, pool water, and natural water sources. Acanthamoeba keratitis is a rare but severe corneal infection that’s extremely difficult to treat, can take months to resolve, and in the worst cases causes permanent vision loss.
The contact lens creates the perfect environment: a warm, moist surface held against the eye, trapping whatever was in the water underneath it. Without the lens, the same organisms would wash off with your tears. With the lens, they stay.
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The honest version Most people who swim in contacts get away with it. But Acanthamoeba keratitis, while rare, is devastating when it occurs – and it’s almost entirely preventable by simply not wearing contacts in water. The risk-reward calculation isn’t close. |
Prescription Swimming Goggles
Available in standard prescription powers, relatively inexpensive, and the simplest safe solution for regular swimmers. They won’t match a complex prescription perfectly, but for most people they’re more than clear enough for lane swimming. We can advise on the right power to order based on your current prescription.
Daily Disposable Lenses (With Goggles)
If you really need contact lenses in the water, wearing daily disposable lenses under tight-fitting goggles is the next-best option. The goggles prevent water contact, and the disposable lens is thrown away immediately after the swim – no overnight contamination, no reuse. This is a pragmatic compromise, not a risk-free one.
Just Swim Without Correction
If your prescription is mild, swimming uncorrected is perfectly safe. You don’t need pin-sharp vision to swim laps. For open-water swimming where seeing clearly matters more, prescription goggles are the better route.
Even without contact lenses, pool chlorine and salt water can irritate the eye surface, causing redness, stinging, and a gritty feeling after swimming. This is usually a temporary chemical irritation that resolves within a few hours. Rinsing your eyes with clean water after swimming helps. If irritation persists beyond a day, or is accompanied by significant pain or vision changes, get it checked.
If you’re a regular swimmer and you’ve been wearing contacts in the pool, it’s worth having a quick conversation about safer options. As opticians in Glasgow’s Southside, we can advise on prescription goggles, suitable daily disposables, and check your eyes for any signs of irritation or early infection. Get in touch or call 0141 427 4040.
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It's strongly advised against. Water contains microorganisms that can become trapped under the lens and cause serious corneal infections, including Acanthamoeba keratitis.
Wearing daily disposables under tight-fitting goggles and discarding them immediately after is a pragmatic compromise, but removing the lens from the water equation entirely (prescription goggles) is safer.
Chlorine can cause temporary irritation, redness, and stinging, but doesn't typically cause lasting damage. Rinse your eyes with clean water after swimming. Persistent pain or vision changes should be assessed.
Prescription swimming goggles are available in standard prescription powers. We can advise on the correct power to order based on your current prescription.
Severe eye pain disproportionate to how the eye looks, redness, light sensitivity, excessive tearing, and blurred vision - usually developing days to weeks after water exposure while wearing contacts. Seek urgent assessment if you experience these symptoms.
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Team Mosspark Opticians