![]() This means we don't see light that hits this exact spot. The area where the bundled nerve fibers pass through the retina does not contain any light sensitive cells. In humans and most vertebrates the optic nerve fibers pass through the retina and out of the back of the eyeball. When light hits the rod and cone cells, nerve impulses are triggered and sent to the brain through the optic nerve. Rods provide black-and-white vision in dim light whereas the cones are responsible for color vision. The retina has two types of light-sensing cells: rods and cones. Inside the eye the light lands on the retina at the back of the eye, which is a light-sensitive layer of tissue. How much light gets into the eye is controlled by the iris, which is the colored part around the pupil that can contract and expand to open and close the pupil. Usually what we see is light that reflects off of objects and then enters our eyes through the pupil (the pupil is the opening in the middle of the front of the eye). To be able to see, however, we need light. Our eyes are complex organs that allow us to detect visual objects, colors, motion and other things happening around us. There are, however, some ways you can make these blind spots come to light, so to speak! This activity will show you how to find them. Normally you don't notice these blind spots at all. Did you know that you have a blind spot in each of your eyes? This doesn't mean you see a constant black spot in your field of vision. ![]()
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