Retina.
a flat, colored, ring-shaped membrane of the eye is called the iris
Your eyes are an extension of your brain. In fact most of your brain is light sensitive, and will respond by recalling memories!
The nervous system. Your eyes are part of your brain. The majority of your brain surface is light-sensitive.
The optic nerves
the iris
The emulsion of a camera is a coating on the lens that is sensitive to light. It has that in common with the human brain as both take in signals from light and process them.
Brain stem
The brain stem is what connects the spinal cord to the rest of the brain. More specifically, the medulla oblongota is what directly connects it.
The spinal cord connects tissues and organs to the brain.
The Brain stem connects these two portions of the brain.
The innermost part of the eyeball is the retina, which contains light-sensitive cells that convert light into electrical signals for the brain to interpret.
Your photosensitive eyes are an extension of part of the brain surface. From clever experiments it is known that all of the surface of the brain is photo sensitive. Even some primitive organisms that do not yet have a brain, nevertheless have light sensitive receptors that are used to direct actions.