<prompt> Under NPCB, screening of school children is first done by -School teachersVillage health guideOphthalmologic assistantMedical officer  <response>: Children are being first screened by trained teachers. Children suspected to have refractive error are seen by ophthalmic assistants and corrective spectacle are prescribed. Ref- Park;s textbook of Preventive and social medicine 24th edition. 