You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Under NPCB, screening of school children is firstdone by and explain in detail?
School teachers Under the National Programme for Control of Blindness, all children aged 10-14 years will be screened for refractive errors by trained teachers. Children who cannot read the 6/9 line with any eye are then sent to the ophthalmic assistant of the CHC for refraction test. Children needing spectacles are then provided free spectacles by opticians who have been contracted by the NPCB.