The document discusses the structure and components of the human eye. It has five main parts. The outermost layer is the sclera, which provides shape and protection. Inside this is the choroid layer, which contains blood vessels. The innermost layer is the retina, where light signals are transmitted to the optic nerve. Different cell types are found in the different layers - pigment and nerve cells in the outer layers, and photoreceptor cells in the inner retina. The light signals are interpreted as either color or black and white depending on the cell type stimulated in the retina.

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