If you don't have color deficiency, it's hard to imagine color blindness. Just play with this simple app and get a felling of how it is. ColorBlindCam can simulate most situations, such as protanopia, protanomaly, deuteranopia, deuteranomaly, tritanopia, tritanomaly, achromatopsia, achromatomaly, etc. And you can save the result to your photo library with just one click.