Dyschromatopsia (number 97) and rectal bleeding: Fig 1

We report three cases of delayed presentation of colorectal disease in colour blind men due to a failure to recognise bleeding as a symptom of their pathology. In all three individuals bleeding was recognised by the spouse and had been misinterpreted as loose motion by the patients. Dyschromatopsia is a common condition; it is important to identify rectal bleeding early in colour blind individuals so as to diagnose and treat the source of the bleeding. Case 1—A 43 year old colour blind man was seen in clinic with painless rectal bleeding which had been noted by his spouse. It had been interpreted as loose motion and had been present for three months. Examination of the abdomen …