GC: n

S: NCBI – (last access: 7 February 2016); AAPOS – (last access: 21 March 2015).

N: 1. Anc Greek α/α (= prefix that denotes absence) χρώμα/chroma (=color) + όψη/opsi (=look, face).
Coined: in 1957 by Blackwell HR, Blackwell OM “Blue mono-cone monochromacy: a new color vision defect” J Optical Soc America 47: 338-341.
2. Acquired colour blindness is usually of the blue-yellow type and can be due to retinal diseases, glaucoma, or optic nerve diseases. Total colour blindness (achromatopsia) is an extremely rare congenital affliction that is typically associated with poor vision, nystagmus (rapid, uncontrollable eye movements), and light sensitivity.
3. Achromatopsia is sometimes called ‘Day Blindness’, as these children see better in subdued light. Children with complete Achromatopsia will have reduced vision (20/200 or less) due to an abnormality of the retina. They also have no color vision, sensitivity to light (photophobia) and the presence of nystagmus (shaking of the eyes). Children with incomplete or partial Achromatopsia may have better vision (20/120 to 20/80).
4. Cultural Interrelation: Artist Neil Harbisson suffers from a visual condition called achromatopsia or total color blindness. Harbisson can only see things in shades of grey. So, he partnered with some computer scientists at the in 2003, who created an “electronic eye” for him.

S: 1. (last access: 7 February 2016). 2. EncBrit – (last access: 21 March 2015). 3. (last access: 21 March 2015). 4. (last access: 7 February 2016).

SYN: 1. color blindness. 2. total colour blindness.

S: 1. DTMe (last access: 21 March 2015). 2. EncBrit- (last access: 21 March 2015).

CR: blindness, daltonism.