This is a 3D model of the human eye. The download come with a set of 5 3D eye models for each diferent color of the iris: blue, green, brown, ambar and black. There is an extra one with no iris texture, prepared for you to customize your own iris texture within the photoshop file included. There is a .pdf file included that explains how you can change the iris in the materials in Cinema 4D. The iris texture is in high resolution format (1500×1500) so you can do close-ups without loosing any quality of the eye.
Please note that the reflections presented in the render of the eye in the preview image is from a HDRI image that is not included.