What causes a little red bump in the eye that causes the person to see black and white?
I doubt the little red bump is a direct cause of this symptom. The Retina of the eye is basically a large membrane of nerves which are light sensitive. Some of these are rod shaped cells and some are cone shaped. The cones are more in the center and are responsible for color vision. We have far fewer cones than rods. The rods see in black and white. It would seem that something has damaged or destroyed the cones of the Retina. As for the red bump I am uncertain. See an optometrist immediately before you loose more of your vision. You could have Glacoma–this will damage the retina–it is a build up of pressure inside the eye-ball.
