Patients presenting with red eyes and blurred vision can be caused by a variety of reasons, such as keratitis, iridocyclitis, glaucoma, and so on. Keratitis patients due to inflammation of the corneal tissue, under the stimulation of inflammation, corneal transparency is reduced, patients may appear blurred vision performance, may also be accompanied by conjunctival congestion, which leads to redness of the eyes. Iridocyclitis is mostly caused by autoimmune reaction, under the stimulation of inflammation, patients will not only experience redness of the eyes, but also suffer from vision loss due to clouding of the aqueous humor, which affects the transparency of the refractive interstitium. Glaucoma patients will have red eyes due to high intraocular pressure stimulation. At the same time, high intraocular pressure causes corneal edema, which affects the transparency of the cornea and leads to blurred vision. Patients with red eyes and blurred vision are advised to seek prompt medical attention to assess their condition and follow medical advice.