Glaucoma is prone to rainbow vision symptoms, but rainbow vision is not necessarily caused by glaucoma. Rainbow vision means that when the patient looks at a light source or a light, a rainbow-colored circle will appear around the light. Glaucoma may cause rainbow vision, while keratitis and cataract may also cause rainbow vision symptoms. 1. Glaucoma: Glaucoma patients with iris vision is mainly due to corneal edema caused by elevated intraocular pressure. 2. Keratitis: Keratitis can cause corneal edema under the stimulation of inflammation, which can lead to iris vision. 3. Cataract: Cataract patients may also experience irises due to swelling of the radially arranged crystalline fibers. It is recommended that patients with iris vision consult a hospital in a timely manner to assess their condition and follow the doctor’s instructions for treatment.