Depending on the individuals severity of color vision deficiency, they can suffer from various elements.
1. Cannot distinguish certain colors.
Symbols and lines in: blue, violet; red, orange, yellow, yellow-green and green.
Depending on their type and severity can become almost the same color or shade and
thus hard to distinguish.
2. Fail to see some objects.
Dark red or magenta symbols and thin lines over black or dark blue backgrounds.
3. Difficult to see emphasized parts.
DARK RED characters in black text.
(For protanopes, dark red appears similar to the color black and therefore "disappears.")
4. Very difficult to tell the name of colors.
RECOGNITION of color difference and IDENTIFICATION of color names are completely
different tasks.
The inability to distinguish or see certain colors can affect the amount of information being processed to the audience.
A major issue here is that warning signs and safety alerts are often done in red for it is known to be a color of attention and stands out. However, many color vision deficient individuals cannot see this color or it converts to a color that does not stand out at all.
