People who wear reusable contact lenses are more likely to develop a rare sight infection, according to a new study. Research by University College London in conjunction with Moorfields Eye Hospital in London found that reusable lenses can increase the risk of Acanthamoeba keratitis (AK), with the study suggesting an increased risk for people who keep their lenses in overnight or while showering.
The Express reports that the study, published in the Ophthalmology journal by University College London, says that while contact lenses are generally very safe, they are associated with a small risk of AK, most commonly caused by bacteria. Lead author of the study Professor John Dart said in a statement: “In recent years we have seen an increase of Acanthamoeba keratitis in the UK and Europe, and while the infection is still rare, it is preventable and warrants a public health response.
“Contact lenses are generally very safe but are associated with a small risk of microbial keratitis, Given that an estimated 300 million people across the globe wear contact lenses, it is important that people know how to minimise their risks for developing keratitis.”
AK cases number about one in 20,000 contact lens users every year in the UK. Symptoms include sensation of something in the eye, eye pain, eye redness, blurred vision, sensitivity to light and excessive tearing. The infection causes the front surface of the cornea to become inflamed. Of those affected, around 25 per cent end up with less than 25 per cent of their vision, while another 25 per cent require corneal transplants.
The researchers studied more than 200 patients from Moorfields. Results showed that those who used reusable contact lenses were just under four times more likely to develop AK. Showering increased the risk of AK by just over three times. Further research estimated that between 30 and 62 percent of AK cases in the UK and other countries could be prevented if the switch from reusable to daily contact lenses was made.
Primary author of the study Nicole Carnt commented: “Previous studies have linked AK to wearing contact lenses in hot tubs, swimming pools or lakes, and here we have added showers to that list, underlining that exposure to any water when wearing lenses should be avoided. Public pools and coastal authorities could help reduce this risk by advising against swimming in contact lenses.”
Professor Dart added: “Basic contact lens hygiene measures can go a long way in avoiding infections, such as by thoroughly washing and drying your hands before putting in your lenses.”
It has been pointed out that the study was an observational one, which means it cannot conclusively say that contact lenses cause AK. Further research through a causational study would be required to reveal a definitive connection between contact lens use and AK.
For stories from where you live, visit InYourArea.
Find recommendations for eating out, attractions and events near you here on our sister website 2Chill
Find recommendations for dog owners and more doggy stories on our sister site Teamdogs
