How the Eyes Work

Vision is something we tend to take for granted or not give a lot of thought as to how our eyes work. The process is of course complicated and requires multiple parts of our bodies and brains to work in unison but with the help of the American Optometric Association we’ll try to explain a bit of how the eyes work.

When rays of light reflect off an object and pass into the eyes through the cornea you can then see that object. The cornea bends those rays that pass through the pupil. The iris (or the colored portion of your eye that surrounds the pupil) opens and closes, making the pupil bigger or smaller. This regulates the amount of light passing through.

The light rays then pass through the lens, which changes shape so it can further bend the rays and focus them on the retina. The retina is the thin layer of tissue that contains millions of tiny light-sensing nerve cells. These nerve cells are known as the rods and cones. They are called this because of their distinct shapes. Cones are concentrated in the center of the retina known as the macula. When there is bright light, cones provide clear, sharp central vision and detect colors and fine details. Rods are located outside the macula and extend all the way to the outer edge of the retina. They provide peripheral or side vision. Rods also allow the eyes to detect motion and help us to see in dim light and at night. These cells in the retina convert the light into electrical impulses. The optic nerve sends these impulses to the brain, which produces an image.

Here’s a little video to help explain how the eye works as well.

At Schmidt’s Optical and Hearing™ in Stuart Florida our well trained employees will be happy to help you with any questions or needs you may have about your vision needs. Stop in and see us today.

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