Family history and reading habits in adult-onset myopia

Purpose. A retrospective study was developed to evaluate risk factors in adult-onset myopia. Methods. Subjects included were 25 to 35 years old. There were 116 non-myopic subjects in the control group and 66 myopic subjects with first lens prescription at age 17 or later. Subjects received a questionnaire about academic achievement, daily hours of reading during years of study, and family history of myopia. Results. The level of academic achievement was similar for myopic and non-myopic groups in this sample. Myopia was associated with family history (chi(2) = 6.131, p less than or equal to 0.013) and with daily hours of reading during years of study (chi(2) = 3.904, p less than or equal to 0.048). According to multiple logistic regression analysis, the correlation of myopia with family history adjusted for daily hours of reading remained significant (p less than or equal to 0.005), whereas the correlation with daily hours of reading adjusted for family history was not significant (p less than or equal to 0.061). Conclusions. After multivariate analysis, adult-onset myopia was significantly associated only with family history of myopia.