A man with color blindness, particularly red-green color blindness, will see red as green. This means that when he looks at something that is red, he perceives it as green. This is because color blindness affects the ability to differentiate between certain colors, specifically red and green. It is important to note that not all individuals with color blindness see colors in the same way, as there are different types and degrees of color blindness. However, in the case of red-green color blindness, the person may have difficulty distinguishing between shades of red and green, leading to a perception of red as green. It`s worth mentioning that color blindness is a relatively common condition, affecting a significant portion of the population to some extent.