A woman lost the sight in one eye after going swimming in a pool at a hotel spa wearing contact lenses.
Jennie Hurst, from Southampton, contracted acanthamoeba keratitis - a rare and painful infection caused by amoeba which naturally occurs in water. The infection causes hypersensitivity to light and the 28-year-old said she was confined to a dark room for three months. She is now warning of the dangers of swimming or showering wearing contacts.
Symptoms of acanthamoeba keratitis include a sensation of having something in the eye, watery eyes, blurred vision, sensitivity to light, swelling of the upper eyelid and extreme pain.
Ms Hurst said she has been left with no vision in her left eye and the damage to her cornea could be permanent.
The environmental coordinator, who had been wearing contact lenses for five years, went swimming at a hotel while on a residential training course with work.
"The irony is that I don't even like swimming - I only did a few laps," she said, "My consultants were quite surprised that I had gone swimming and probably thought that I had been a bit lazy whereas I wasn't aware of the problem at all - it didn't even enter my brain to take them out.”
"I felt guilty that I had let it happen when actually I could have just taken my contacts out and saved everyone a lot of time and bother and myself a lot of pain. I have always been so careful with my contact lenses. I always remove them when sleeping and always use contact lens solution to wash them."
According to the British Contact Lens Association there are 3.7 million contact lens wearers in the UK which represents 7.5% of the adult population.
Parwez Hossain, the consultant ophthalmologist who treated Ms Hurst at Southampton General Hospital, said: "If you've been wearing contact lenses and you start developing irritation in the eye and sensitivity to the light which doesn't settle down after a few hours you need to go and see a doctor or optician.
"If it lasts longer than 24 hours you need to go and see an eye specialist."
The British Contact Lens Association said risk factors for infection in contact lens wearers include：
Using tap water during lens care (to rinse lenses or the storage case) or inadequate hand drying prior to lens handling
Wearing lenses while swimming (without goggles), showering or in hot tubs
Using ineffective lens care solutions
Failing to follow lens care instructions
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