News Excerpt:
Photoreception is activation of a biological process by light. Most organisms, including humans, respond to light. Some animals react to light waves not perceived by humans.
About Photoreception:
Photoreception is the process that describes how photoreceptors like rods and cones absorb light waves that enter the eye and convert them into electrical signals which are then sent to the brain for visual processing.
Photosensitive cells in vertebrates:
- Rods:
- The rods, which are long and fat, contain large amounts of visual pigment and they mediate vision under dim illumination (scotopic vision).
- Cones:
- The cone cells, which are relatively small, mediate daylight vision (photopic vision) and colour sensation.
