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Let's Take a Look at Your Eyes...

There are 4 main parts of the human eye that aid in vision.

Disease at any of these levels can cause a

reduction in visual acuity.

The Cornea:

  • Clear part of the eye that vaults over the iris, the colored part of the eye

  • Contact lenses sit on this part of eye. Painful ulcers and scars can occur if contacts are not worn or cleaned properly.

  • Curvature of the cornea (known as astigmatism) can affect vision, but is correctable with glasses/contacts.

The Cornea

human eye.jpg

The Optic Nerve:

  • Sends signals to and from the brain from the eye

  • Glaucoma is the most common disease affecting the optic nerve. Glaucoma can cause loss of peripheral (side) vision and can sometimes lead to blindness.

The Optic Nerve

The Lens:

  • Sits behind the iris, helps us focus on objects and images

  • Part of the eye that swells with increases in blood sugar; this can cause a shift in one's glasses prescription and can aid in the diagnosis of diabetes

  • Muscles surrounding the lens become less flexible with age and the lens thickens, causing a decrease in near vision around the age of 40 (known as presbyopia)

  • Cataracts affect this part of the eye.  Most patients with age-related cataracts have the lens removed in their 60s-70s.

The Lens

The Retina:

  • The tissue that lines the back of the eye that is composed of several layers, one of which contains millions of cells called rods and cones

  • Rods help us with peripheral and low-light vision, while cones are located in the macula and help us with color, detailed, and central vision

  • The retina sends signals to the optic nerve and this helps us see

  • Some conditions affecting the retina include:

    • Macular Degeneration

    • Diabetic Retinopathy

    • Hypertensive Retinopathy

    • Retinal Tear / Detachment

The Retina

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