German eye expert warns of pool chlorine irritation and contact‑lens water risks

Prof. Gerd Geerling, director of the University Eye Clinic Düsseldorf and spokesperson for the Stiftung Auge, explains that chlorine in public pools can combine with urine‑derived urea or sweat, creating a irritant that damages the surface cells of the cornea and conjunctiva. People with an unstable tear film are especially vulnerable. He advises using preservative‑free artificial tears, applying eye drops before and after swimming, and wearing well‑fitting swimming goggles. Persistent redness after two days warrants a medical check; self‑treatment with steroids or antibiotics is discouraged.

The same specialist warns that wearing contact lenses while swimming in lakes, rivers, or even domestic water sources greatly increases the risk of severe eye infections such as Acanthamoeba keratitis and microbial keratitis—an issue affecting up to 13 000 cases annually in Germany. He recommends removing lenses before any water contact, using goggles with prescription lenses if vision correction is needed, and never rinsing lenses with tap or seawater; only sterile lens‑care solutions should be used. In hot weather, temporary lens wear reduction and frequent use of lubricating drops can help protect the eyes.

Key preventive measures include UV‑blocking sunglasses for outdoor exposure, proper lens hygiene, and prompt ophthalmologic consultation for pain, light sensitivity, blurred vision, or persistent redness.