| | Conditions Treatments | Eye Vision Disorders What percent of the world has black eyes? It is not possible to determine with certainty what percent of the world has black eyes since people of different ethnic backgrounds have varying iris colors. Eye Vision Disorders - Related Articles Stem Cell Heart Treatment How have blood vessels adapted to carry out their job? How to Diagnose Hiatal Hernia With Ultrasound Tips on Easing Hip Pain While Pregnant Infant Boil Treatment The Apple Cider Vinegar Cure for Lyme Disease How does hemoglobin carry 02 in the blood?