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