Since Goodman and coll. introduced the concept of cone dysfunction syndromes, many papers have been published. Some authors based their diagnosis on functional data while others referred to the classic denominations. As a consequence there is no uniformity with regard to terminology of the cone dystrophies. In an effort to avoir the introduction of new terms the author presents a classification of cone dysfunctions based on the results of electroretinography and color vision examination. This classification is dynamic since it allows the follow-up of a cone dystrophy into its late stages.