•The eye is a complex optical instrument consisting of several parts.
•The cornea is exposed to the outside environment and therefore must repair itself rapidly because it is constantly faced with abrasion. It is transparent to all visible and near infrared wavelengths.
•The lens is transparent to visible and near infrared light. Together with the cornea, the lens focuses light to the back of the eye. The shape of the lens changes to accommodate near or distant viewing.
•The retina is the layer of nerve cells that receives the image and sends signals to the brain.
Credit: http://ehs.unc.edu/training/self_study/laser/eye.html
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