We perceive yellow when our L cones are stimulated at around 95% of their maximum and M cones at roughly 55% of their maximum (this ratio corresponds to a wavelength of about 580 nanometers).
What is the function of rods and cones in the eye?
Rods and cones are the two different categories of photoreceptors found in the human retina. Cones are in charge of vision in brighter environments, whereas rods are in charge of vision in low light. Mesopic refers to the range of light where both can function.
Rods:
- Capable of scotopic vision (low light levels).
- Populate the retina's outer edges.
- They have a rod design that makes it easier to see at night or in low light.
- Include the vitamin A-rich rhodopsin pigment necessary for night vision, making rods sensitive to light.
Cones:
- Responsible for color perception, high spatial acuity, and photopic vision (higher light levels).
- They are mainly located in the retina and are populated in the central fovea region.
- Cone-shaped and aid in highlighting color and other subtle features.
- They come in three varieties: L-cones, M-cones, and S-cones, which are sensitive to long, intermediate, and short waves respectively (S-cones)
- These contain the violet-colored iodopsin pigment.
Learn more about rods and cones here:
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