A method includes inserting a light source into an item of head apparel, such that the light source is substantially contained within a volume of the item of head apparel. An apparatus includes a light source and a head apparel bill. The head apparel bill is configured to receive the light source, such...http://www.google.co.uk/patents/US7111956?utm_source=gb-gplus-sharePatent US7111956 - Apparatuses and methods for vision assistance
