Whether or not a sudden loss of vision in one eye can be restored needs to be considered on a case-by-case basis and cannot be generalized. If a patient has a sudden onset of redness, swelling, pain and vision loss in the eye, it is usually considered keratitis, uveitis or glaucoma. In patients with keratitis, corneal infiltration foci may occur, resulting in corneal clouding and affecting vision; in patients with glaucoma, a sharp increase in intraocular pressure may lead to corneal edema, resulting in vision loss; and in patients with uveitis, an inflammatory response may lead to pupil narrowing and anterior chamber clouding, affecting vision. If there is no obvious abnormality in the appearance of the eye, but there are symptoms such as dark shadows in front of the eyes, it may be a vitreous hemorrhage, retinal detachment, central retinal artery blockage, central retinal vein blockage, macular hemorrhage caused by high myopia, and other diseases. Therefore, when a patient experiences a sudden loss of vision in one eye, he or she should promptly visit the ophthalmology department of a hospital to have a diagnosis made by a professional doctor, and symptomatic treatment should be implemented to promote the recovery of the eye’s vision.