<prompt> Under Vision 2020, to check visual acuity, teacher will refer school child toService centreTraining centreCentre for excellenceVision centre  <response>: Under Vision 2020, to check visual acuity, teacher will refer school child to Vision Centre Vision 2020 Right to Sight Major aim - eliminate avoidable blindness by 2020. They are Global India 1. Cataract 1. Cataract 2. RE Low vision 2. RE Low vision 3. Childhood blindness 3. Childhood blindness 4. Trachoma 4. Trachoma 5. Onchocerciasis not present in India 5. Diabetic Retinopathy 6. Glaucoma 7. Corneal Blindness Number of Authorised bodies Population Norms 2 APEX 1500 million 20 Centre of Excellence 150 million 200 Training Centre 15 million 2000 Service Centre 1500000 20000 Vision Centre 150000 Rajendra prasad institute of Ophthalmic sciences, AIIMS, Delhi: Services offered at Vision centre - vision testing - PMOA Service centre - cataract surgery - ophthalmologist Training centre - Training - opthal depament of medical college 