1. Light enters the eye: Light rays pass through the cornea (the clear outer layer of the eye) and the pupil (the opening in the iris).
2. Focusing: The lens behind the pupil focuses the light rays onto the retina at the back of the eye.
3. Retina's role: The retina contains photoreceptor cells called rods and cones.
* Rods are responsible for vision in dim light and perceive black and white.
* Cones are responsible for color vision and work best in bright light.
4. Photoreceptor activation: When light hits the rods and cones, it triggers a chemical reaction, converting light energy into electrical signals.
5. Signal transmission: These electrical signals travel through the optic nerve to the brain.
6. Brain interpretation: The brain processes the signals and interprets them as images.
In summary: The process of seeing involves light entering the eye, being focused onto the retina, triggering chemical reactions in photoreceptor cells, generating electrical signals, and transmitting those signals to the brain for interpretation.
