This darkly pigmented structure reduces light reflection within the eyeball.

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The choroid is a darkly pigmented layer of tissue in the posterior portion of the eyeball that reduces reflection of light within the eye. This helps to prevent scattering and distortion of the incoming light, allowing for clearer vision. The sclera is the white, tough, outer layer of the eyeball that provides shape and protection. The conjunctiva is a thin, transparent layer that covers the front of the eyeball and lines the inside of the eyelids. The iris is a circular structure that controls the amount of light that enters the eye by changing the size of the pupil. The retina is a layer of light-sensitive cells at the back of the eye that transforms incoming light into neural signals that are sent to the brain.

This Darkly Pigmented Structure Reduces Light Reflection Within the Eyeball