Foggy and blurred vision is mostly caused by lesions in the refractive interstitium (e.g., cornea, lens, vitreous) and retina. Different causes of blurred vision may also be accompanied by other manifestations. If the blurred vision is accompanied by red eyes, photophobia and tearing, it is considered to be caused by eye inflammation; if the blurred vision is accompanied by eye swelling, headache, nausea and vomiting, it is considered to be caused by high intraocular pressure; if the blurred vision occurs after prolonged close eye use, it is considered to be caused by visual fatigue or dry eye; if the blurred vision is clear at near and blurred at far, it is considered to be caused by myopia; if the blurred vision is clear at near and blurred at far, it is considered to be caused by presbyopia; if the elderly If you have painless progressive blurred vision, consider cataract; if you have blurred vision and a sense of obscuration, consider vitreous opacity, retinal detachment, optic neuropathy; if you have deformation, consider macular degeneration; if you have severe headache and vomiting, consider cranial hypertension, etc. So simply seeing things foggy can not diagnose a disease, many diseases can be manifested as blurred vision, if not relieved by rest, should promptly go to the hospital for eye examination, clear diagnosis, the cause of treatment.