(2014) found different selections for real protanopes and real deuteranopes.
Pridmore, 2014) [L.sub.R] values over one for real protanopes and the pseudoachromatic greens (they see such stimuli lighter than do common observers) but [L.sub.R] values below one for real deuteranopes (they see the pseudoachromatic greens darker).
Age in Years Protanope Deuteranope Tritonope 30-40 -- -- -- 41-50 -- -- -- 51-60 1 1 -- 61-70 -- -- -- Sample size calculations were done by using previous prevalence of 39.5% (6).
Out of these 30 subjects, 22 subjects were tritonope, 4 protanope, and 4 deuteranope, which is in agreement with the study published by Sinha A K, Bhatia R et al.
For example, in the protanopes' case, the unavailability of L cones (Birch, 1993) would imply that YT is only mediated by M and that, for the red primary, YT = 13.57.
The two observer types for whom alterations in luminance-lightness are the most well known are protanopes and aged tritanomalous (op.
Distribution of Protanopes
and Deuteranopes Colour Blind Protanopes
Deuteranopes Total Affected 20 (1.2%) 3 (0.19%) 23 (1.4%) Table 3.
The differences are statistically significant, except for normal participants between G and Y signals, for deuteranomals between G and Y signals, for deuteranopes between R and Y signals, for protanomals for Y signals with both R and G signals, and for protanopes
for Y signals with both R and G signals.
The classification plates are more effective for deuteranopes than protanopes
, with a correct classification possible for around 90% of deuteranopes and around 80% of protanopes
The neutral points for deuteranopes, protanopes
and tritanopes are around 498nm, 492nm and 569nm respectively.