Early vision loss in diabetic patients assessed by the Cambridge Colour Test - Ventura, Dora Selma Fix; Costa, Marcelo Fernandes da; Gualtieri, Mirella; Nishi, Mauro; Bernik, Marcia Martins Silveira; Bonci, Daniela Maria Oliveira; Souza, J. M. (Normal and defective colour vision, 2003)