1. A method comprising: computing using a processor a smallest bounding rectangle for enclosing a first eye color defect region; dividing a neighborhood region of the smallest bounding rectangle into a plurality of regions having an average pixel intensity; computing an average pixel intensity of the enclosed first eye color defect region, and a number of neighborhood regions having average pixel intensity lesser than a second predetermined fraction of the average pixel intensity of the enclosed first eye color defect region; and determining presence of an eye color defect at the computed first eye color defect region upon determining the number of neighborhood regions having an average pixel intensity less than the second predetermined fraction of the average pixel intensity of the enclosed first eye color defect region being greater than a second predetermined threshold.