Visual acuity refers to the ability of the examining eye to distinguish the smallest object, which reflects the function of the macular central hollow of the fundus. For vision loss, corresponding treatment should be done according to the cause. Refractive error: For vision loss caused by refractive error, vision loss can be treated by bringing glasses. For adults with high myopia who do not have durable lenses, laser surgery, such as full- or half-femtosecond surgery, can be considered to help treat vision loss. 1. myopia: parallel light rays are focused on the retina before the refractive system of the eye, and are often corrected with concave lenses, and can be treated with laser surgery if the conditions are suitable for surgical indications. 2. hyperopia: parallel light rays are focused on the retina after the refractive system of the eye, and are corrected with convex lenses. After that, it is corrected with convex lenses; 3. Astigmatism: Astigmatism is a refractive irregularity, which is generally corrected with columnar lenses. Eye infections: 1. keratitis: keratitis is usually caused by infection, often accompanied by varying degrees of vision loss, and should be treated locally with antibacterial drugs and antifungal or antiviral drugs under the guidance of a referral physician; 2. sclerenitis: usually sclerenitis also causes varying degrees of vision loss, eye pain and pressure pain, and can be treated with immunosuppressants or glucocorticoids for anti-inflammatory treatment under the guidance of a physician. Eye lesions: 1. cataract: cataract surgery is a long-established treatment method, and vitreous implantation is usually performed under the operating microscope. 2. glaucoma: vision loss caused by glaucoma can be treated with drugs for IOP control as a priority, such as trichothecene drops and carbonic anhydrase inhibitors, etc., and surgery will be performed after the IOP is well controlled. 3. fundus macula. Fundus macula can also lead to varying degrees of vision loss, a condition that can usually be treated with laser surgery or glucocorticoid medications; 4, retinal vascular disease: can be treated with medications, or treatment that causes its primary cause, and if necessary, surgical laser photocoagulation therapy and photodynamic therapy. Reduced visual acuity can occur in many eye diseases. In addition to improving the level of visual acuity in treatment, it is usually necessary to avoid excessive eye use and develop good eye habits to help maintain a normal standard of vision.