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Colour vision defects associated with ocular disease have been reported since the 17th century. Objectives were to study prevalence of colour vision abnormalities associated with diabetic retinopathy & to study the type of colour vision defect associated with diabetic retinopathy. A longitudinal descriptive study was conducted. 70 patients diagnosed with Diabetic Retinopathy were selected. Colour vision was tested by using Ishihara & HRR Pseudoisochromatic charts. When Evaluated using HRR plates 29 (41.42%) patients were found to have colour vision impairment. Among them 20 (68.96%) patients had colour vision impairment of the blue-yellow axis purely & 3 (10.34%) patients of red-green axis purely & 6 (20.70%) patients of both axis. Colour vision especially of the blue-Yellow axis was found to be affected in this study. Colour vision and visual testing can be used as cheap, quick, non-invasive, portable tool for screening of diabetic retinopathy.