"Spooky" contact lenses could leave people who use them for Halloween facing a real-life horror. Experts at Moorfields Eye Hospital NHS Foundation Trust in London are warning that, if not used properly, people could suffer vision loss or infection.

It's advised that the increasingly popular coloured cosmetic lenses should only be sold by a registered optician or doctor who is able to provide after-care advice. The lenses are often illegally sold online, in shops and on market stalls.

Each year we treat patients, including children under 16, who have developed eye conditions after wearing cosmetic contact lenses. 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. 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.

Badrul Hussain, Consultant Ophthalmic Surgeon

The cornea, the clear window at the front of the eye, is delicate and can be easily scratched which makes the eye vulnerable to nasty infections. Vicky Dermott from the General Optical Council is advising Halloween party-goers to protect their sight by buying lenses from a qualified professional.