People who suffer from colourblindness have been given advice on choosing sunglasses that will not hinder their ability to read traffic signals.
Dr Danielle Moch of the Eye Centre of the Dakotas told North Dakota"s NBC News Leader that colourblind people must take care.
"They shouldn"t think they can pick any sunglasses off of a rack anywhere," she said, adding that certain coloured lenses "definitely could affect their ability to distinguish traffic signals".
In addition, it was reported that colourblind people should wear yellow-brown tinted or grey shaded sunglasses.
Bill Chaussee, who is colourblind, told the news source that he can have difficulty telling yellow lights from red.
by Adrian Galbreth