How Do The Eyes Work?


Our vision allows us to be aware of our surroundings. However, many people often wonder how do the eyes work?  Eighty per cent of everything we learn is through our sight.

Your eye works in a similar way to a camera. When you look at an object, light reflected from the object enters the eyes through the pupil and is focused through the optical components within the eye.

All the different parts of your eyes work together to help you see. Our eyes are remarkable on how they work capturing images and relaying them to our brains.


Anatomy of the Eye


Anatomy of the eye

First, light passes through the cornea (the clear front layer of the eye). The cornea is shaped like a dome and bends light to help the eye focus.

Some of this light enters the eye through an opening called the pupil (PYOO-pul). The iris (the colored part of the eye) controls how much light the pupil lets in.

Next, light passes through the lens (a clear inner part of the eye). The lens works together with the cornea to focus light correctly on the retina.

When light hits the retina (a light-sensitive layer of tissue at the back of the eye), special cells called photoreceptors turn the light into electrical signals.

These electrical signals travel from the retina through the optic nerve to the brain. Then the brain turns the signals into the images you see.

Your eyes also need tears to work correctly.


How Tears Work


Tears keep your eyes wet and smooth, and help focus light so you can see clearly. They also protect your eyes from infections and irritating things, like dirt and dust.

Every time you blink, a thin layer of tears called a “tear film” spreads across the surface of your cornea (the clear outer layer of the eye). Tears come from glands above your eyes, then drain into your tear ducts (small holes in the inner corners of your eyes) and down through your nose.

When your eyes don’t make enough tears, or your tears don’t work the right way, you can get dry eye. We will have a future blog on dry eyes very soon.



What are tears made of?

Tear film has 3 different layers:

  • The oily outer layer keeps tears from drying up too quickly and makes the surface of the eyes smooth.
  • The watery middle layer keeps the eyes wet and nourishes the eye tissue.
  • The inner mucus layer helps the tear film stick to the surface of the eyes.

Each of these layers play an important part to keeping your eyes hydrated and comfortable.  Schedule an appointment with our optometrists at the Walmart Vision Center Crystal Lake, IL or Walmart Vision Center Harvard, IL today.

Dr. Jeffrey Porter, OD and Dr. Will Watson, OD  provide quality eye exams in Crystal Lake, Woodstock, Harvard, IL, and surrounding communities.

Call us:

Walmart Vision Center Crystal Lake, IL


Walmart Vision Center Harvard, IL