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.
Enjoy! 