The eye is an incredibly complex organ, composed of many different parts. Of these parts, the retinal, uveal, corneal, irian, and iridian are all components of the eye. The retinal is a light-sensitive layer of tissue that lines the back of the eye and is responsible for vision. The uveal is a layer of tissue that lies between the retina and the sclera, and it helps to protect the eye from injury. The corneal is the transparent outer layer of the eye that covers the iris and pupil. The irian is the colored part of the eye, which controls the amount of light entering the eye. Finally, the iridian is the thin, curved membrane that covers the front of the eye and helps to focus light on the retina. Together, these five parts of the eye work together to allow us to see.