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The fundus is the interior lining of the eyeball, visible with an ophthalmoscope. It is characterized by large blood vessels that supply the retina. The most prominent feature is the optic disk, where the optic nerve fibers exit the eye. This area lacks photoreceptor cells, creating a natural blind spot in our vision. The retina itself is a complex nervous tissue that receives light and converts it into nerve impulses, which are then sent to the brain via the optic nerve, initiating the sensation of vision.123

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