When a person looks at a light and sees a colored halo around the light, the medical term is “iris vision”. The so-called colored halos are also known as colored halos. Rainbow vision, this is due to the refractive error of the eye and produce a spectral effect, the front of the white light, according to the various wavelengths of light contained in the different and decomposed into a variety of color components, thus appearing the typical color halo. Iridescence is a frequent symptom of eye disease and can be seen in glaucoma, conjunctivitis, corneal edema, incipient cataracts, and other eye diseases. Treatment of primary eye disease.