How do humans detect color? Considering your answer to this question, predict why some \"colorblind\" individuals are unable to distinguish between certain colors. Solution Human eye is impartent and comlicated . human eye is just like camera and having the ability of self focusing .Light from an external object is refracted as it move through the cornea and move to the pupil .Light again refracted by the lens which project image on the ratina .In tatina light is absorbed by cone and rod cells .there are 6-7 million cones in ratina . three different type of cone is present in ratina sensitive to short medium and long wevelength .cones respond to red blue and green light .the signals from cones transmited to brain by nerve . the ganglion of brain cells determine the colour. Colour blind human are unable to distiguish between certai colour due to insensitivity of cone cells . When the cone cells are insensitive to long wavelength red colour look darker than they actually are . the green tend to look similar to red . when cones are insensitive to medium wavelength and human can not see red and green colour . when cones are insensitive to shoet wavelength light human can not distinguish blue and green colour ..