IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-10-3-33828 Original Research Paper Clinical Study of Retinal Changes of Diabetic Patients Undergone Cataract surgery with Pre-existing Diabetic Retinopathy and Without Pre-existing Diabetic Retinopathy in a Tertiary Center of West Bengal. NAJNIN Dr. March 2021 10 3 01 02