. Once through the pupil, light rays move through the soft, crystalline lens. Slightly convex in front and markedly so behind, the lens focuses light on the retina, which lies on the back and sides of the eye's inner walls. A suspensory ligament holds the lens in place behind the iris, attached to ciliary muscle which, when contracted, pulls on the ligament, which in turn pulls the lens, thus causing the elastic lens to flatten. In order for light to find its way to the retina, it mus
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