Is tap water really safe for your eyes? Know the hidden risk of Acanthamoeba and its symptoms

Tap water is a household staple, yet it may carry hidden dangers for your eyes. Health experts warn about Acanthamoeba keratitis (AK), a rare but potentially devastating eye infection linked to contaminated water exposure. The risk is especially high for contact lens users, since rinsing or storing lenses in tap water creates an easy pathway for the microscopic parasite to reach the cornea. Though uncommon, AK can cause severe eye pain, persistent inflammation, redness, blurred vision, light sensitivity, and, in advanced cases, even permanent blindness. Recognising early symptoms, avoiding risky habits, and following proper lens hygiene are essential to protect and preserve long-term vision.A UK study published in Ophthalmology revealed a clear link between household tap water and Acanthamoeba keratitis (AK). Researchers collected water samples from the homes of people with AK and discovered: In 89% of homes, tap outlets contained free-living amoebae, including Acanthamoeba.In nearly one-third of cases (30%), the same strain of Acanthamoeba found in tap water was also detected in the patient’s infected eye.Tap water is safe to drink, but it’s not sterile. When people rinse or store their contact lenses in tap water, tiny amoebae can cling to the lens. Once the lens is placed on the eye, these organisms can transfer directly to the cornea. Even small scratches from inserting or removing lenses make it easier for Acanthamoeba to invade and cause infection.This study clearly shows that everyday tap water can act as a hidden source of dangerous eye infections, especially for contact lens users who skip proper hygiene.Acanthamoeba are microscopic, free-living protozoa found in soil, tap water, pools, and even air-conditioning units. They can exist in an active trophozoite stage or a highly resilient cyst form, capable of surviving extreme conditions. When Acanthamoeba infects the cornea, it causes Acanthamoeba keratitis (AK). Common symptoms include: a painful infection that progresses slowly, often mistaken for other eye conditions, making early diagnosis and timely treatment essential for preventing severe complications.Untreated, AK can lead to severe corneal damage and even permanent vision loss Acanthamoeba keratitis develops when the parasite enters the cornea, usually through contaminated water or improper lens hygiene. Several factors raise the risk:The impact of AK can be severe and long-lasting:Rarely, in severely immunocompromised individuals, Acanthamoeba can cause life-threatening systemic infectionsFollow these evidence-based strategies to protect your eyes:Regular eye care check-ups and proper hygiene can significantly reduce risk; AK is largely preventableDisclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making any changes to your health routine or treatment.Also read | Diabetes warning! Excessive thirst could be the silent symptom you are missing