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What is the retinal pigment epithelium (RPE), choroid, and sclera in the retina?

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Retinal pigment epithelium (RPE) is a layer of dark tissue beneath the photoreceptors. These cells absorb excess light so the photoreceptors can give a clearer signal. They also move nutrients to (and waste from) the photoreceptors to the choroid.

The choroid is separate from the RPE. It lies behind the retina and is made up of many fine blood vessels that supply nutrition to the retina and the RPE.

Sclera is the tough, white, fibrous outside wall of your eye. It’s connected to the clear cornea in front and protects the delicate structures inside the eye.

Reviewed by Whitney Seltman on October 11, 2019
Reviewed by Whitney Seltman on October 11, 2019

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