Pediatric Health Library :: Pediatric Health Library Topics
What is the normal visual pathway?
- Light enters the eye through, and is bent by, the cornea, the clear, dome-shaped surface that covers the front of the eye.
- From the cornea, the light passes through the pupil. The iris, or the colored part of your eye, regulates the aperture, or size, of the pupil.
- From there, light passes through, and is further bent, by the lens (the transparent structure inside the eye that focuses light rays onto the retina).
- Next, it passes through the vitreous humor, the clear, jelly-like substance that fills the center of the eye and helps to keep the eye round in shape.
- Finally, the light reaches the retina, the light-sensitive nerve layer that lines the back of the eye.
- The optic nerve is then responsible for carrying the signals to the area of the brain (the visual cortex) which assembles the signals into images (i.e., our vision).
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