• 360-755-EYES
  • 866-856-1505 (3937)
  • Mount Vernon
  • Sedro-Woolley
  • Stanwood
  • Anacortes
  • Coupeville
    • Mount Vernon

    • 2100 Little Mountain Ln
    • Mt Vernon, WA 98274
    • Phone: 360-416-6735
    • Fax: 360-424-6954
    • Sedro-Woolley

    • 2131 Hospital Drive
    • Sedro-Woolley, WA 98284
    • Phone: 360-416-6735
    • Fax: 360-856-1206
    • Stanwood

    • 26910 92nd Ave NW #C6
    • Stanwood, WA 98292
    • Phone: 360-629-4180
    • Fax: 360-629-3840
    • Anacortes


    • 1110 12th Street
    • Anacortes, WA 98221
    • 360-293-9312
    • Coupeville


    • 109 NE Birch Street
    • Coupeville, WA 98239
    • 360-678-2020

Precision Focus...From Every Angle.

Precision Focus...From Every Angle.

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How the Eye Works

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Click to Enlarge

Our eyes are incredible organs that give us a window into the wonders of the world. Understanding how your eye works can help immensely when trying to comprehend changes in your eyesight that may occur.

The thickest layer of our eye consists of the sclera, which is the white part of our eyes and gives them their round shape, and a clear structure called the cornea. The cornea works to focus light as it comes into the eye. After passing through the cornea, light comes to the pupil, the hole which can be found at the center of your iris (the colored part of your eye, which is actually a muscle). The pupil will expand or contract in order to let in the appropriate amount of light. Once light has made it through the pupil, it reaches the lens. The muscles that hold the transparent lens will tighten or relax, adjusting the shape of the lens and allowing you to focus your vision on something either near or far. The image will then be flipped upside-down as it passes through to the back of the eye, where it is received by a sensitive inner layer of the eye called the retina. The retina converts this image into electrical signals, which are then sent through the optic nerve to the brain. When these signals reach the brain, they are translated into images, allowing us to see.

Learn more about how the eye works from our knowledgeable team of eye care specialists at North Cascade Eye Associates. Contact us today!