“Color blind” doesn’t necessarily mean you only see shades of gray. In fact, it is extremely rare to be truly color blind (that is, you see only black and white).
For this reason, “color vision deficiency” (CVD) is a more accurate term. To have CVC means colors are visible but in different shades and intensities than normal.
It’s estimated around 300 million people worldwide suffer from CVD (approximately 8% of men and 0.5% of women).