Which of these concepts is NOT a color vision deficiency disorder ?

Protanopia
Deuteranopia
Emmetropia
Monochromacy
Emmetropia is the state of vision where a faraway object at infinity is in sharp focus with the eye lens in a neutral or relaxed state. Protanopia, Deuteranopia, Monochromacy - color blindness, also known as color vision deficiency, is the decreased ability to see color or differences in color.
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Answers by country

Protanopia
Deuteranopia
Emmetropia
Monochromacy
answers
flagPakistan
0%
0%
71%
18%
32
flagGreece
5%
0%
70%
23%
17
flagAustralia
10%
25%
60%
5%
20
flagthe United States
9%
14%
45%
28%
75
flagSwitzerland
9%
12%
45%
30%
33
flagIndia
11%
20%
42%
25%
54
flagRepublic of Ireland
26%
0%
40%
33%
15
flagNigeria
0%
20%
40%
40%
10
flagPoland
15%
17%
33%
33%
3122
flagGermany
17%
22%
30%
29%
268
flagthe United Kingdom
14%
11%
30%
41%
62
flagAustria
26%
14%
28%
26%
42
flagthe Netherlands
27%
27%
27%
18%
11
flagCanada
28%
21%
21%
28%
14
flagItaly
33%
9%
14%
42%
21