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317.2020.NOW Contact Us

Eye Surgery - How the Eye Works

in Indianapolis, Indiana

One of the best ways to understand how your eyes work is to picture the inside of a camera.

Light rays enter your eye through your cornea, the clear round surface of your eyeball.

Because your cornea is curved, it bends the light as it travels towards the back of the eye.

As the light rays pass through your eye's crystalline lens, they're further bent, or refracted, because your eye’s lens is also curved.

If your eyesight is perfect, the light rays land precisely on your retina, the back inside surface of the eye, which is like the film for the camera.

When the light lands precisely on your retina, you see a clear image of whatever you were looking at. This image is translated into electrochemical information that your optic nerve carries from your retina to your brain. Your brain then interprets that information and translates it into a word or words describing the image.

Common Vision Problems

Nearsightedness or Myopia

When your cornea and your lens bend the light rays too much, they focus in front of your retina instead of precisely on it. This causes the image to be blurry and makes it harder for your brain to recognize it. If you are nearsighted, objects close up are clearer than objects in the distance.

Farsightedness or Hyperopia

If you are farsighted, you experience a similar effect for objects that are close up.  The difference is that if you are farsighted, if the light rays focus behind your retina. This makes objects that are close up appear to be blurry.

Astigmatism

When your cornea’s curvature is irregular you have astigmatism. An astigmatic cornea is not round, instead it has multiple curvatures, so that it scatters light rays instead of focusing them on your retina. Many people have some degree of astigmatism but only a few have severe astigmatism. If you are astigmatic, your vision is distorted at all distances.

Presbyopia

Your eyes age just like the rest of the body. Inside your eyes, you have tiny muscles that control the crystalline lens, making it less or more curved, so that it bends the light rays less or more, and that is how you can see clearly at all distances. This is called accommodation.

As your eye ages, your lens becomes more stiff. This reduces your ability to change focus, so that you can see relatively well for distance (if you do not have nearsightedness or astigmatism), but your close up vision becomes increasingly blurry. That's when you need reading glasses.

Please call or email us today to schedule your complimentary vision evaluation. We will answer all of your questions while you check out our state-of-the-art facilities and meet our experienced LASIK eye surgery team.  We’ll work hard to provide you with an unsurpassed life-enhancing experience. We look forward to welcoming you to the 20/20 Institute.