X-rays are a type of radiation called electromagnetic waves. X-ray imaging creates pictures of the inside of your body. The images show the parts of your body in different shades of black and white. This is because different tissues absorb different amounts of radiation. Calcium in bones absorbs x-rays the most, so bones look white. Fat and other soft tissues absorb less and look gray. Air absorbs the least, so lungs look black.
The macula is located at the back of the eye in the center of the retina. A healthy macula allows for clear central vision. The macula is made up of densely packed light-sensitive cells called cones and rods. Cones give the eye color vision, and rods let the eye see shades of gray.
Just here to read stories and write a few. I do some fan fiction on 50 shades of grey I don't not own any of the rights every thing including the basic story line and all characters belong to E L James author of 50 shades of grey. I just love the book 2b1af7f3a8