As magnetic resonance imaging(MRI)technology has the features of non-invasive, clear imaging, and high resolution to soft tissue, it has been used to both the clinic applications and basic researches of ophthalmic diseases. The most important applications of MRI in ophthalmology are orbital and ocular tumor diseases. In recent years, MRI has been gradually applied to clinical and scientific research of visual impairment. The purpose of this paper is to introduce the applications of MRI in the field of ametropia, cataract, glaucoma, amblyopia, optic nerve diseases, choroidal disease, retinopathy, and so on.