The Establishment Of Refractive Development Database Of Adolescent And Its Predictional Function Study

Objective:To investigate the effectiveness and the feasibility of the refractive development database of adolescent, and try to pridict the refractive condition under noncycloplegic condition,and try to determine the cut-off points of sreening refractive error in different ages.Methods:The subjects were randomly selectcd fromm a population-based and cluster salmpling research project,which there are totally10,244eligible adolescents involved. Questionnaires and general ocular examinations were respectively performed in tile following studies.616adolescents were chosen to perform cycloplegic examnination.The questionnaire includcd:general materials, reading habit and hi story (personal and family)The eye examinations included:distant visual acuity measurment, cycloplegic refractive measurement, cover test, ocular motility evaluation and fundus.The datum were examined, verified and recorded by the special person. Datum have been input twice to ensure the accuracy. All the managment of datum were finished in SPSS13.0soft ware, the statistical method included t-test, ANOVA, Chi-square, linear regression and correlation etc.Results:1. The spherical equivalent decreases gradually with ages; the cylinder diopter and axis have no significant change with ages. As the age increases, the prevalence of myopia increases, hyperopia decreases, however, the prevalence of astigmatism is similar between different ages.2. The spherical equivalent diopter increased afler cycloplegia with statistical significance, the change of cylinder diopter and axis is statistical significant. There is significant difference of the spherical equivalent changing magnitude betwteen6and14years old adolescents; As the age going, the changing magniitude of spherical equivalent after cycloplegia is decreasing. 3. There is positive correlation between non-cycloplegic spherical equivalent and cycloplegic spherical equivalent. The Pearson correlation coefficient is statistical significallt. There is linear regression between non-cycloplegic spherical equivalent and cycloplegic spherical equivalent. The regression coefficient is statistica significant, we can forecast the cycloplegic refraction by non-cycloplegic refraction and the regression equation.4. When screening for refractive error by autorefraction in non-cycloplegia, the cut-off points must be adjusted with ages. We should increase the cut-off points for myopia and decrease them for hyperopia, however, the cut-off point of screening for astigmatism is the same as usual.Conclusion:1. The prevalence of refractive error in scllool-age Chinese adolescent is severely high, especially for myopia, which has been a major public health problem in Chinese adolescent. The relevant strategies are needed to reduce the undetected and correctable refractive error.2. There is linear regression and correlation between non-cycloplegic sphefical equivalent and cycloplegic spherical equivalent. According to the linear regression equation, we can forecast the cycloplegic spherical equivalent by the non-cycloplegic spherical equivalent in different ages.3. Screening for refractive error in school-age adolescent by autorefractor under non-cycloplegia is feasible and effective. The appropriate cut-off points of screening for myopia and hyperopia must be adjustcd with ages. However, the cut-offpoint for astigmatgism is the as we usually use.