colour vision Flashcards
Why is colour vision assessment important for certain careers?
It is important for careers like police, armed forces, pilots, and electrical engineers.
What are some educational fields where colour vision is relevant?
Chemistry, geography, and history.
Why is colour vision important for safety?
It helps in recognizing traffic lights, electrical wiring, and electronic PCBs.
How is colour information coded at the level of ganglion cells?
Through 2 opponent colour channels (Red vs. Green, Yellow vs. Blue) and 1 opponent luminance channel (White vs. Black).
What is the visible spectrum range for the human eye?
380-780 nm.
What are the three types of photoreceptors responsible for trichromatic vision?
S, M, and L cones.
To what wavelength is the red cone photoreceptor most sensitive?
620-700 nm (long wavelength).
To what wavelength is the green cone photoreceptor most sensitive?
500-575 nm (medium wavelength).
To what wavelength is the blue cone photoreceptor most sensitive?
450-490 nm (short wavelength).
How do cones and rods differ in function?
Cones function at high illuminance levels, while rods function at low levels of illumination.
What percentage of cones are sensitive to short wavelength (blue light)?
Only 2%.
Where are genes coding for red and green cone photopigments located?
On the long arm of the X chromosome.
Where is the gene coding for blue cone photopigments located?
On chromosome 7.
Why is congenital colour vision deficiency more common in men than women?
It is a recessive X-linked trait, affecting 1 in 12 males and 1 in 250 females.
What is a protan deficiency?
Confusion between reds and greens, both appearing as desaturated yellow.
