In this study, the investigators provide participants who had congenital cataract the multifocal contact lenses and bifocal spectacles in the purpose of seeking out a better way to make a definite diagnosis with high efficiency and accuracy, and report a prospective, randomized controlled study aiming at comparison of multifocal contact lenses and bifocal spectacles.
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Inclusion Criteria: * diagnosed as binocular cataract * after the surgery of binocular intraocular lens implantation more than one month Exclusion Criteria: * diagnosed as xerophthalmus * diagnosed as other eye diseases or systemic diseases