Eye examination mainly includes the following items: i. Visual acuity examination: to check for amblyopia, low vision, etc.; ii. Slit lamp examination: mainly to check for cataract, conjunctivitis, keratitis, etc.; iii. Intraocular pressure examination: including non-contact intraocular pressure measurement and pressure leveling intraocular pressure examination, mainly for the diagnosis of various glaucoma; iv. Fundus examination: including direct ophthalmoscopy and indirect fundoscopy, mainly for Retinal vascular disease, retinal detachment, optic neuritis, uveitis and other diseases; v. Ophthalmic ultrasound: mainly used for the diagnosis of vitreous hemorrhage, retinal detachment and other diseases; f. Optometry: mainly used to understand the refractive state of the eye, the presence of myopia, astigmatism, hyperopia and the determination of the prescription; g. OCT: mainly used for the differential diagnosis of macular fissure, macular anterior membrane, retinal splitting, etc. Color vision examination: mainly used for the diagnosis of color blindness and color weakness.