One eye sees with a halo, consider vitreous lesions, refractive media changes, anterior uveitis, glaucoma, retinal disease, etc. 1. Posterior vitreous detachment: on the basis of vitreous liquefaction, the posterior vitreous cortex is separated from the inner retinal border membrane. As the vitreous cortex is tightly adhered at the optic nerve, it is not easy to be detached, and the vitreous fluid will accumulate in front of the retina to form a ring, which leads to a halo in seeing, and a halo-like visual sensation can be produced when the vitreous is turbid. 2. Refractive media changes: keratitis, conjunctivitis, mucus and oil, etc. in the pupil area of the corneal surface refraction, can see aperture; lens clouding, corneal scarring can be similar to halo around the lights like luminescence. 3. Anterior uveitis: iritis, glaucomatous ciliary body inflammation syndrome, etc., the inflammatory reaction of the anterior chamber is prominent, which can lead to atrial aqueous flash, atrial aqueous clouding, so that the eyes can see things with a halo. 4. Glaucoma: In acute attack of glaucoma, aqueous flashing, corneal edema, make the cornea like a diffraction grating, split the white light, forming a colored ring, i.e., iris, appearing as a colored halo-like aperture. 5. Retinal disease: before retinal detachment, there may be flashing sensation and halo-like vision change, which is caused by the vitreous body suddenly pulling the retina. If you have a halo in one eye, you should consult a doctor in time and cooperate with the doctor for active treatment after perfecting the eye examination.