Though eyes are a very complex organ, I can throw some light on the eye layers which are the most common part of this organ.
The outer most layer of the eye is called the conjunctiva, it is a very thin epithelial cell layer which keeps the eye moist and protected from the dust and environmental pollution.
Cornea comes second and it holds extreme importance when it comes to the job of the eye for the vision.
It reflects the light and bends it to the retina so that it acn be focused vlearly on to the fovea.