Regularly leaving your contact lenses in while taking a shower can increase your risk developing a painful and eyesight-threating infection seven-fold, a study warned.
Researchers from the UK surveyed the habits of 78 contact lens wearers to determine the risk factors for developing contact lens-related microbial keratitis.
This condition causes a painful redness of the eye and ulcers on the surface of the cornea. If left untreated, it can cause blurred vision and permanent corneal scarring.
The team also found that wearing contact lenses while sleeping can increase your risk of microbial keratitis three-fold.
It is estimated that some 4 million people in the UK wear contact lenses. Associated eye infections are common, and a leading cause of single-eye vision loss.
Microbial keratitis affects thousands of people in the UK alone each year.
Keeping your contact lenses in while taking a shower (pictured) can increase your risk developing a painful and eyesight-threating infection seven-fold, a study warned (stock image)
‘Contact lenses for visual correction offer many benefits,’ ophthalmologist Parwez Hossain of the University of Southampton told the Telegraph.
However, he added, ‘contact lens-related microbial keratitis is a frequent cause of permanent visual impairment and some cases may even need a corneal transplant or lead to loss of the eye.’
‘Poor contact lens hygiene is a known contributor to infection, with 66 per cent of complications attributed to poor hygiene practices and great variation in hygiene awareness and recognition of the risks among regular contact lens wearers.’
In their study, Professor Hossain and colleagues interviewed 78 lens wearers— of whom 37 had previously developed microbial keratitis — about their use of contacts.
Specifically, the subjects were asked about the type of lenses they used, how long they wore them for, their personal hygiene habits and whether or not they ever slept or showered while still wearing their lenses.
The team found that not removing lenses before showering was a major cause of infection, with the risk of microbial keratitis increasing seven-fold among those who took a shower daily.
Shower heads can provide a breeding ground for bacteria which can ultimately end up spread under the surface of a contact lens.
Similarly, the subjects who slept in their lenses — depriving the cornea of oxygen and recovery time — were found to increase their risk of infection three-fold.
Age was also found to be a risk factor — with those between the ages of 25–39 being at the greatest risk.
Microbial keratitis causes a painful redness of the eye (pictured) and ulcers on the surface of the cornea. If left untreated, it can cause blurred vision, corneal scarring and blindness
‘Contact lens wear is safe providing wearers carefully follow personal hygiene advice issued by their optometrist or contact lens practitioner,’ said paper author Parwez Hossain
‘Worldwide approximately 140 million people successfully wear contact lenses with a very low incidence of any serious complications,’ president-elect of the British Contact Lens Association, Neil Retallic, told the Telegraph.
However, he added, ‘this research is welcomed to help promote and raise awareness of how to maximise safe wear.’
‘We have supporting guidance available for both eye care teams and contact lens wearers to influence attitudes and to reinforce good contact lens routines.’
‘We must all work together to ensure behaviours which minimise risk become permanent habits.’
‘Contact lens wear is safe providing wearers carefully follow personal hygiene advice issued by their optometrist or contact lens practitioner,’ added Professor Hossain.
The full findings of the study were published in the journal BMJ Open Ophthalmology.