NATS 1870 Lecture Notes - Lecture 4: Color Vision, Retina, Hermann Von Helmholtz
21 Jan 2019
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Document Summary
This colour doesn"t have a wavelength, and it"s defined by the absence of green. We have three main kinds of vision: luminosity. Black and white contrast, in normal daylight, discerns edges/boundaries between objects: colour. In normal daylight, this discerns colour and edges of objects. More hazy/less sharp, hard to discern colour and edges. Light which enters the eye is detected by rods and cones, on the retina. Rods and cones both contain types of photopigment molecules that absorb photons: rods. 120 million in each eye: cones. Each type of cones detects a range of wavelengths. Most cones are located in the fovea. 1801: thomas young was the first to have the idea that we have 3 types of receptors in the eye, which would allow us to perceive all colours, as each colour resonator" would be active to a different degree. 1867: hermann von helmholtz published a book on optics and colour vision.
