Parts of the Eye and Explanation of parts

Here is a labelled diagram of the eye and below that is a short explanation of the parts.

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the choroid coat, the middle layer is deeply coloured with melanin. It reduces the reflection of drifted ray light within the eye. The choroid coat forms the iris in the front of the eye. This, too, is coloured and is responsible for eye colour. The size of its aperture, the pupil, is variable and under the control of the autonomic nervous system. In dim light, the pupil opens wider letting more light into the eye. In bright light the pupil closes down. This not only reduces the amount of light entering the eye but also improves its image-forming ability

The retina is the inner layer of the eye. It contains the light receptors, the rods and cones. The retina also has many interneurons that process the signals arising in the rods and cones before passing them back to the brain.