Color blindness, also known as color vision deficiency, is the decreased ability to see 
Do you know what colors are most commonly hard to see with the color blindness illness?
Its not about color but vision.it's a decreased ability to see color or differences in color.  
Ohh I see. What do people with color blindness do to cope with the effects of it?
People with total color blindness, however, may also have decreased visual acuity ,and rarely cope in brightness