Color Blindness.Rod Monochromatism.Stationary Cone Dystrophy
Achromatopsia is a hereditary vision disorder that eliminates the ability to see color. In rare instances of complete achromatopsia, achromats are only able to see black, white, and various shades of grey.
"People say to me, 'It must suck to not see color.' I'm thinkin' I wouldn't know, I've never seen it." -Karl Schwonik
Within the retina, there are rod receptors and cone receptors. Cone receptors are typically used in brightly lit, colorful situations. Rod receptors are used in dimly lit situations and provide low-detailed images. Achromats' rod receptors work well, but the cone receptors do not.
Achromatopsia is rare, recessive, autosomal disorder. There is only 1 achromat per 33,000 births. It is found on the 2q11, 8q21-8q22, 10q24, 14 chromosomes. If both parents carry the gene, each child would have a 25% change of inheriting the disorder, and each child would have a 50% chance of being a carrier.
99% of color blind people have incomplete achromatopsia, meaning they can see some hues but frequently confuse color wavelengths. Red-green color blindness and blue-yellow color blindness are the most common forms. Red-green makes up 75% of cases. These people struggle with green, red, and brown. People suffering with blue-yellow color blindness struggle with colors like blue, green, yellow, and violet. Incomplete achromatopsia is a sex-linked disorder.
A Story of Achromatopsia