DRESSING up for Halloween is fun for thousands.

But budding witches, warlocks, black cats and devils in Somerset are being urged to avoid using spooky novelty contact lenses that could harm their eyes.

Staff at Taunton Specsavers have warned that fancy dress revellers could play a nasty trick on their eyes by using costume lenses and make-up this October 31.

Not knowing how to wear or care for contact lenses can result in minor eye conditions such as red eye, infections and scratches – as well as more serious complications that can, in severe cases, lead to sight loss.

Scott McGowan, ophthalmic director at Taunton Specsavers, said: "Halloween contact lenses have become popular in recent years. However, consumers often are not aware of the risks associated with misusing contact lenses.

"In particular, if a wearer hasn’t had a proper consultation with an optometrist beforehand, they probably haven’t been taught how to wear or care for their lenses correctly.

"The results can be nasty and range from mildly irritating complications to potentially sight-threatening conditions such as corneal infections like microbial keratitis."

He said anyone who does try the lenses and experiences discomfort should visit an optician immediately.

It is also important to ensure any spooktacular makeup is properly removed before going to bed, he added.

"Leaving your eye makeup on when you go to sleep – particularly eyeliner and mascara – will increase your chances of getting bacterial and oil build-up around your eyes or even inflammation," said Mr McGowan.

"Make sure you always gently remove beauty products to reduce infection and keep your eyes clean."

Here are the tips from Specsavers on how to avoid a frightening mishap this Halloween:

1. Seek guidance from your optician before using novelty contact lenses

2. Avoid purchasing cheap products online

3. Clean and store your lenses properly to avoid infection

4. Do not fall asleep in your lenses

5. Never share contact lenses with other people