The screening strategy for prevention of blindness from diabetic retinopathy according to the NPCB involves -
Opportunistic screening
High risk screening
Mass screening
Screening by Primary Care Physician
High risk screening is applied to the group which has increased risk of developing certain disease/cancer.
Diabetic retinopathy patients are at increased risk of developing blindness. Therefore, screening strategy for prevention of blindness from diabetic retinopathy is high risk screening.