The use of an accurate simulation tool (Brettel, Vienot, & Mollon, 1997; Lillo, Alvaro, & Moreira, 2014; Vienot, Brettel, & Mollon, 1999) will serve to determine whether a deuteranope
sees these lines as similar colours (greenish yellows) and, therefore, can confuse them.
The top row shows the colorized version followed by a desaturated version thereof and emulated deuteranope
vision (red-green blindness) in the bottom row.
'Green', say, just means something different to the deuteranope
from what it means to most people.
Out of these 8 subjects, 5 subjects were deuteranope
and 3 subjects were protanope.
Longer-wavelength color stimuli (dominant wavelength > 540 nm) -- which arouse the perception of red, orange, yellow, and green colors for a person with normal color vision -- all appear yellow to a deuteranope
, although there will be variations in be rightness; for example, reds will appear darker than yellow stimuli.
Table 1 Examples of colours that might be confused by colour deficient observers Colour deficiency Examples of colours that might be confused Protanope Blue--green/white/red Pale blue/purple/magenta Red/orange/yellow/green Deuteranope
Purple/Grey/greenish blue-green Red/orange/yellow/green Red/brown, green/brown Tritanope Yellow/white Violet/yellow-green Red/red-purple
Followed by which presence of colour blindness were noted and again the colour blindness was divided into protanopes and deuteranopes
depending on the response.
Out of 26 affected males, 9 (2%) were protanopes and 17(3.8%) were deuteranopes
while among females 6 (0.6%) were protanopes and 4 (0.4%) were deuteranopes
(Table I, Fig.
Spectral Edge reports that in a trial of 90 people, 60 of whom had some form of colour blindness (including 40 deuteranopes
), 93% of participants found watching processed videos "perfectly acceptable," enabling colour blind and non-colour blind viewers to watch content together on the same screen.
Previous work (Lillo, Moreira, Alvaro, & Davies, 2012; Moreira, Lillo, Alvaro, & Davies, 2012) analyzed dichromats' (protanopes and deuteranopes
) use of Basic Color Terms (BCTs).
The participants were divided into five groups: normals, deuteranomals, deuteranopes
, protanomals, and protanopes.
For example, a dog may literally see red (that is, what humans would call red) when looking at Garfield the cat, who seems orange to normal humans and who often looks yellow to deuteranopes