Using out-of-date make-up can lead to eye infections such as conjunctivitis and styes, contact lens wearers have been told.
Dr Susan Blakeney, optometric adviser from the College of Optometrists, spoke to hellomagazine.com about eye health and make-up, recommending that mascara and liquid eyeliner should be discarded six months after opening.
"Water-based eye shadows have a much shorter shelf life than powder products because the liquid element is a good environment for bacteria," she explained to the website.
Eye shadow brushes should be cleaned on a regular basis as well so that dirt, oil and germs do not build up.
The College of Optometrists has a number of recommendations for keeping eyes safe while applying make-up.
One of these is to place contact lenses in before the make-up is put on, which will make it simpler for people to see what they are doing and will also mean they are not as likely to get make-up underneath the lenses.
Research from Debenhams recently showed that 68 per cent of women only replace make-up and skincare when they run out.
by Adrian Galbreth