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How The Eye Works To best understand the process of visual input, consider that a camera creates images by focusing on an object and allowing specific, regulated amounts of light to pass through a hole; the end result is the creation of a visual impression on film. With your vision, light enters the cornea much like a camera lens, and enables the eye to focus. The light then passes through the pupil (the hole), as the iris works to adjust the amount of light allowed to enter. Light then enters the lens where the remaining required focus is achieved. The shape of the lens adjusts, either thinner or thicker, by tensing or relaxing the muscles of the eye. The retina is the final destination of this focused light, which functions the same way as film; the retina converts the light into a signal using cells called rods and cones. These signals travel to your brain where the “film” is developed into an image. The result is the miracle of sight. Furthering the camera analogy, much like a photograph vision quality is best close up, while distance and often even mid-range vision is blurred.
The anatomy of the eye... With today's advanced vision correction procedures, you need to have a basic understanding of the anatomy of the eye:,/p>
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