Final answer:The choroid, a heavily pigmentedvascular layer, forms the largest part of the eye. It delivers oxygen and nutrients to the outer layers of the retina and helps to focus clear, solid images by absorbing light and reducing glare.Explanation:The heavily pigmented vascular layer that forms the bulk of an eye is called thechoroid. This critical part of the eye provides oxygen and nourishment to the outer layers of the retina.Thechoroidis packed with blood vessels and melanin, which is a dark pigment that absorbs light to prevent it from scattering within the eye. The absorption of light by the choroid also enhances the sharpness of visual images by reducing glare.Learn more about Choroid here:brainly.com/question/31915110#SPJ11...

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