When Crayola‘s senior designer Emerson Moser retired in 1990 – after 37 years of loyal services – he finally admitted he was color vision deficient… Moser went on to produce a record 1.4 billion crayons during his career! While any type of color vision deficiency (color blindness) could make crayon production difficult, complete color vision deficiency where someone can only see in shades of gray is extremely rare. About 99% of color vision deficiency is just the inability to distinguish between some couples of complementary colors. You can test your color vision on my website.
1 in 12 people have some sort of color blindness that makes them unable to distinguish certain colors or shades of colors from others. Color blindness is, however, an inaccurate term to describe a lack of perceptual sensitivity to certain colors; a more precise term is: Color Vision Deficiency (CVD). Color blindness is the most commonly used term though it is misleading if taken literally, because colorblind people CAN see colors, albeit they cannot make out the difference between some couples of complementary colors. Color vision deficiency is not related to visual acuity at all and is most commonly due to an inherited condition. Red/Green color vision deficiency is by far the most common form, about 99%, and causes problems in distinguishing reds and greens. There is no treatment for color vision deficiency, nor is it usually the cause of any significant disability.
The most commonly used test to detect color vision deficiencies is the Ishihara Color Test.
Color vision deficient people have a tendency to better night vision and, in some situations, they can perceive variations in luminosity that color-sighted people could not. In fact, most color blind people can easily read what is written in the dotted pattern below… If you fail the test, that means you probably have the full range of color sensitivity that is attributed to color-sighted people.
[Highlight the blank space to see the answer: NO]