What is a colorful vision?

Color Vision is the ability to detect color in the environment. Specific colors are perceived by photoreceptors or cones found on the retina at the back of the eye; The cone type determines the specific colors perceived. People and primates from the Old World have three types of cones, while most other mammals have only two. Birds have four types that allow them to see ultraviolet light, and insects have the same number of cone types as humans, although not the same type. The absence or disorder of specific cones can lead to color blindness. The retina of man and primacy contains three types of color receptors: red, blue and green. Mixing these three colors can create all colors that trichromates can perceive. Insects also have three types of cones: green, blue and instead of red, ultraviolet light sensitive light.

Color vision of dogs and most other mammals is dichromatic. Having only two types of cones in the eye - green and blue - means that color perception is compared to human, bird and insectspoorly. Many mammals usually have better senses than vision. Dogs may not be able to clearly see small spots of red blood, but generally can feel even a small amount of fragrance impossible for human olfactory senses.

birds, turtles and fish have tetrachromatic color vision. They have four different types of cones in their eyes that perceive blue, green, red and ultraviolet light reflected from objects. Many birds have feathers in an ultraviolet range that play a role in the selection of mating. Studies suggest that a small percentage of women may also have tetrachromatic color vision, although not on ultraviolet wavelengths. Two to 3 percent of women may have another photoreceptor located between the red green.

Color blindness occurs when a person is missing certain pigments in the tapes of the retina. Approximately 8 percent of men and 4 percent of women have defective color vision due to inherited properties associated with chromosome X. People withColorful blinds often have difficulty in distinguishing between red and green; This can cause problems with color determination in the traffic light or how the "finished" meat is. The test that is generally used to determine color blindness includes the request of a person to find out a number from a circle filled with dots of different colors. Children too young to recognize numbers can be asked to point out shapes such as stars, circles or squares.