Children diagnosed as cataract without treatment were enrolled to a prospective, randomized controlled study. Patients were assigned to four groups: participants in group A wearing multifocal contact lenses a week and then bifocal spectacles a week;in Group B, the participants wearing bifocal spectacles a week and then multifocal contact lenses;in Group C, the participants wearing multifocal contact lenses four a year;in Group D, the participants wearing bifocal spectacles four a year. Investigators compare the acuity, refraction, contrast sensitivity and the results of questionnaire between A and B , C and D groups.