Eye experts are warning of the risks of wearing novelty contact lenses at Halloween, saying they can cause nasty infections and scratches to the eyes. Cosmetic contact lenses are often sold in joke and fancy-dress shops and on websites, but they come without instructions on safe use. Eye-health professionals say novelty lenses should never be shared, stored in tap water or kept in overnight. In extreme cases, this can lead to impaired vision and sight loss. The Association of