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Vision - Anatomy of the Eye Vision Eyes transduce energy in...

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Anatomy of the Eye Vision * Eyes transduce energy in the electromagnetic spectrum into APs. * Only wavelengths of 400 – 700 nm constitute visible light. * Neurons in the retina contribute fibers that are gathered together at the optic disc, where they exit as the optic nerve. Refraction * Light that passes from a medium of one density into a medium of another density (bent). * Refractive index (degree of refraction) depends upon: * Comparative density of the 2 media. * Curvature of interface between the 2 media. * Refractive index of air = 1.00 * Refractive index of cornea = 1.38 * Image is inverted on retina. Accommodation * Ability of the eyes to keep the image focused on the retina as the distance between the eyes and object varies. Changes in the Lens Shape * Ciliary muscle can vary its aperture. * Distance > 20 feet: * Relaxation places tension on the suspensory ligament. * Pulls lens taut. * Lens is least convex. * Distance decreases: * Ciliary muscles contract.
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