With Halloween just around the corner, thousands will be shopping for fancy dress contact lenses to go with their costume.

The appeal is clear, as their endless colours and shapes allow you to radically change how you look – who wasn't scared by the white and yellow eyes of the girl in ?

However, we also have to be careful. These lenses can cause serious harm – and even blindness – if we fail to take the necessary precautions.

The complications associated with these accessories range from mild symptoms such as dryness, itching and irritation to more serious ones like infections, scarring and loss of vision.

So why are they dangerous? And what can we do to minimise the risks?

Materials matter

Around Halloween, fancy dress contact lenses can be found everywhere. This makes it easy fo

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