Blurred eyes, also known as blurred vision, can be caused by many factors, the common ones include fundus lesions, optic neuropathy, refractive errors, cataracts, and eye inflammation and tumors. If the patient has sudden vision loss without eye pain, it is seen as retinal artery and vein obstruction, ischemic optic neuropathy, retinal detachment, vitreous hemorrhage, and optic neuritis. Gradual vision loss is seen in refractive error, cataract, chronic retinal disease, and open-angle glaucoma. In addition, vision loss combined with eye pain is seen in uveitis, acute angle-closure glaucoma, and inflammatory corneal edema. Loss of vision combined with normal intraocular pressure is seen in retrobulbar optic neuritis, toxic or tumor-induced optic neuropathy, and optic disc edema. In addition transient ischemia, optic cone cell degeneration, psychologically stimulated blackout, upright hypotension, central retinal artery spasm, overexertion, migraine, and hysteria can cause blurred eyes. Other common causes of blurred vision include keratitis, iritis, vitreous turbidity also known as cataract, vitreous hemorrhage, retinopathy, and refractive error can all cause blurred vision, which can be either transient or persistent. In summary, blurred eyes are caused by a variety of causes, including the eye itself, the fundus and the optic nerve, and should be treated clinically and separately.