They are viewed by many as a harmless accessory to complement Halloween costumes.
But spooky contact lenses, sold illegally on market stalls and in joke shops, could leave party-goers at risk of going blind, experts warn.
Novelty lenses, available for around £7 ($9), can trigger ulcers, agonising corneal tears and sight-threatening infections.
The joint warning, issued by Moorfields Eye Hospital and the General Optical Council, follows a string of horrifying cases in recent years during Halloween.
Tia Goode, from Merthyr, Wales, was left in unbearable pain after ripping off her cornea as she was trying to remove a pair of cat-eye contact lenses in 2015.
And Carrie-Anne Balloch, 21, from Leeds, was left in agony after wearing a pair of cat’s eyes contacts at a party last year the year before.
Tia Goode, from Merthyr, Wales, was left in unbearable pain after ripping off her cornea as she was trying to remove a pair of cat-eye contact lenses in 2015
Contact lenses should only be handed out with a prescription in the UK – but fancy colourful ones aren’t available for young revelers.
Instead, they go elsewhere for the cosmetic colour changes. But in doing so, they are risking irreversible damage to their vision.
Unauthorised outlets skip vital safety checks and don’t issue advice on how to use them, meaning they aren’t informed about the dangers of poor eye hygiene.
The joint warning, issued by Moorfields Eye Hospital and the General Optical Council, follows a string of horrifying cases in recent years during Halloween.
Tia Goode, from Merthyr, Wales, was left in unbearable pain after ripping off her cornea as she was trying to remove a pair of cat-eye contact lenses in 2015.
And Carrie-Anne Balloch, 21, from Leeds, was left in agony after wearing a pair of cat’s eyes contacts at a party last year the year before.
Mr Badrul Hussain, consultant ophthalmic surgeon at Moorfields Eye Hospital NHS Foundation Trust, said revellers should be aware of the dangers of spooky lenses.
He said: ‘Each year we treat patients, including children under 16, who have developed eye conditions after wearing cosmetic contact lenses.
‘There can be an increase in these problems in the period around Halloween.
‘Some of the cases we see, like patients sharing lenses with friends, wearing the same pair year after year well past the expiry date, and storing them in tap water, have devastating effects.’
Corneal dangers
The cornea, the clear window at the front of the eye, is delicate and can easily be scratched by inexperienced contact lens wearers.
Carrie-Anne Balloch, 21, from Leeds, was left in agony after wearing a pair of cat’s eyes contacts at a party last year the year before
This can expose the eye to organisms that can cause nasty infections, which in extreme cases can result in the permanent loss of vision, Mr Hussain added.
He warned: ‘Most of the patients haven’t been shown how to look after their cosmetic lenses or their eyes properly.
‘Not knowing the basics of using contact lenses safely can put you at higher risk of developing painful eye injuries, infections and in the worst cases, risk of permanent sight loss.’
Vicky McDermott, chief executive of the General Optical Council, said: ‘When worn safely, the risks associated with cosmetic contact lenses are low.
‘However, when lenses are sold illegally, wearers are denied important safety checks and advice, putting them at risk of serious damage to their eyes.
‘Party-goers can better protect their sight by buying their lenses from a qualified professional.’
What the laws state
It is not currently against the law for retailers to sell cosmetic lenses online in the UK.
It is, however, illegal for non-prescription lenses to be sold or supplied in Britain without the supervision of a registered optometrist, suitably qualified dispensing optician or medical practitioner.
However, novelty lenses are easily available at market stalls and small shops all over the UK.
Echoed sentiments
The British Contact Lens Association echoed the concerns ahead of Halloween revelers flocking to fancy dress shops for the lenses.
President Keith Tempany said: ‘Wearing fancy lenses might make you look cool for one night on Halloween, but losing your sight could be a lifelong horror story.
‘Cosmetic coloured lenses are a medical device and should be prescribed by an eye care professional.
‘These lenses should only be purchased from – and fitted by – a registered practitioner.
‘By sharing coloured contact lenses young people are playing Russian roulette with their eye health and putting their sight at risk.’