When a person is looking at lights, if a colored halo appears around the lights, it is medically called “iris vision”. The so-called colored halos are also known as colored halos. The iris appears in front of the eye due to a change in the refractive power of the eye, which breaks down the white light coming from the front into multiple color components depending on the wavelength of the light it contains, resulting in a typical colored halo. This is because iris is not a symptom specific to glaucoma. Acute conjunctivitis secretions, which are more viscous, and the refraction of light by tears, can also cause transient iris. In addition, in early cataracts, aqueous gaps or aqueous fissures occur in the lens cortex, which can produce light refraction in the middle of the visual axis and cause iridopsia. In some patients with cataract or inner eye surgery, the endothelium is damaged during surgery, causing endothelial loss of compensation and corneal epithelial blister-like changes, which can also produce iridopia. In conclusion, glaucoma can appear as iridopia, but the appearance of iridopia is not always glaucoma, so we need to combine each person’s symptoms and carefully examine the cornea, intraocular pressure and lens to make a correct judgment.