Refraction in the eye
Cameras are designed much like the human eye, with mechanisms that control and focus light images. In an instant, the eye can intercept, focus and interpret light through a process called refraction.
Identification
Refraction is the eye's ability to bend and focus light rays into a sharp image.
Focus
Refraction in the eye mainly takes place on the surface of the cornea. The lens focuses the light image onto the center of the retina, which is located at the back of the eye.
Photoreceptors
Light-sensitive cells in the retina called photoreceptors capture light like a camera and relay those images to the brain through the optic nerve.
Refractive Error
Vision problems involving refraction are due to the eye's inability to focus an image onto the retina. Corrective lens can be used to treat most refractive errors.
Accommodation
The eye's lens can change shape so that objects at different distances can still be focused onto the retina. This is called accommodation.
Astigmatism
Eyes with astigmatism have an irregular surface shape that skews light rays and prevents the lens from properly focusing.
Tags: focus light, image onto, light rays, onto retina, shape that