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# The Eye, a Complex Organ, Result of Evolution ## Human Eye and its Function - Course ### Photoreceptor Cells of the Retina * **Rods:** Photoreceptors that are sensitive to variations in light intensity. * **Cones:** Photoreceptors that detect specific wavelengths of light when the light intens...

# The Eye, a Complex Organ, Result of Evolution ## Human Eye and its Function - Course ### Photoreceptor Cells of the Retina * **Rods:** Photoreceptors that are sensitive to variations in light intensity. * **Cones:** Photoreceptors that detect specific wavelengths of light when the light intensity is sufficient. * Green * Blue * Red → **Trichromatic vision** of the human eye **(Diagram Description):** The diagram illustrates the structure of the retina, showing the arrangement of rods and cones, as well as the different layers involved in signal transmission. Rods are depicted as long, slender structures, and cones are smaller, with distinctive shapes. Arrows indicate the direction of signal transmission, both horizontally and vertically through the layers of cells in the retina. Different cell types, including horizontal cells, bipolar cells, and amacrine cells, are labeled and positioned in the diagram to show the complex network involved in processing visual information. A labeling at the bottom of the diagram designates the layers of the retina, including the pigmented epithelium, photoreceptor segments and cell bodies.