What is different about the eyes of a color blind person?

There is no physical difference in the eyes of a color blind person compared to someone with normal color vision. Color blindness, also known as color vision deficiency, is a condition that affects how a person perceives colors. It is caused by abnormalities in the cone cells in the retina, which are responsible for detecting different colors of light. Color blind individuals may have difficulty distinguishing between certain colors, such as red and green, or blue and yellow.