Evolution of human colour vision as 'visual purple' receptor proteins, are encoded by Rh1, OPN2 and RHO genes. They are characterized by extreme sensitivity to light and enable monochromatic human vision in low light or dim conditions. They are broken down into retinal and opsin when exposed to these conditions. Humans have 3 types of photopsin proteins found in the cone cells. Long Wavelength Sensitive Opsin (Red cone opsin) – Encoded by the OPN1LW gene with a λmax of 560 that is found in the yellow-green electromagnetic spectrum despite its name. Its sensitivity to the colour red is still known to be higher than the
Eye to Eye (Taher Shah song) where he sings about "sensational eyes, emotional eyes, colourful eyes, exciting eyes, fabulous eyes, spectrum eyes, human eyes, my eyes, your eyes...". The music video, which gained notoriety for its absurd and nonsensical English lyrics, shows Taher Shah swaying side to side to the song while singing and blinking coyly at the screen. A duplicate of Shah, dressed in black with sleek hair, is also seen in the video singing and swaying alongside the white-clad Shah. At one point in the video, the two give a short message: "Eye to eye, makes a peculiar love, lifetime, once in a life.