The document summarizes key aspects of vision and color perception. It explains that light is detected by the retina's rods and cones and transmitted as neural signals. The young-Hemholtz theory proposes that the three color-sensitive cone types process red, green and blue wavelengths and combine to perceive other colors. Further processing in the visual system analyzes color opponent channels before color perception in the visual cortex.

1. M.Mohamed Rizwan

3. *Note: the retina has many receptor cells which convert the inverted image (light energy) into neural impulses. When sent to the brain, these neural impulses are reassembled to create a perceived, upright-seeming image. Lens – focuses the incoming rays by changing its curvature (called accommodation) Iris – a colored muscle that surrounds and dilates or constricts the pupil (regulates amount of light entering) Pupil - small opening which allows light to enter. Retina – the light-sensitive surface on which the rays focus – the multilayered tissue that lines the inside of the back of the eyeball