PREVALENCE OF MYOPIA AND ITS RISK FACTORS IN URBAN SCHOOL CHILDREN IN DELHI: THE NORTH INDIA MYOPIA STUDY (NIM STUDY).

PurposeAssess prevalence of myopia and identify associated risk factors in urban school children.MethodsThis was a cross-sectional study screening children for sub-normal vision and refractive errors Nail Polish in Delhi.Vision was tested by trained health workers using ETDRS charts.Risk factor questionnaire was filled for children with vision

The discrete control processes with state evaluation in time of dynamical system Nail Polish is considered.A general model of control problems with integral-time cost criterion by a Controllers trajectory is studied and a general scheme for solving such classes of problems is proposed.In addition the game-theoretical and multicriterion models for c