What is the outermost layer of the retina that provides metabolic support and absorbs light not absorbed by photoreceptors?

What is the outermost layer of the retina that provides metabolic support and absorbs light not absorbed by photoreceptors?

• A. Retinal pigmented epithelium
• B. Choroid
• C. Neural retina
• D. Sclera

Answer: (A)

The layer that sits just outside the neural retina and provides metabolic support while absorbing light is the retinal pigmented epithelium. It supports photoreceptors by transporting nutrients and removing waste, participates in the visual cycle to regenerate the light-absorbing pigment, and uses melanin to absorb stray light that photoreceptors didn’t capture, reducing glare and scattering. The other layers have different roles: the choroid beneath supplies blood but isn’t the outermost retinal layer, the neural retina is the light-detecting tissue itself, and the sclera is the eye’s tough outer coat.

The layer that sits just outside the neural retina and provides metabolic support while absorbing light is the retinal pigmented epithelium. It supports photoreceptors by transporting nutrients and removing waste, participates in the visual cycle to regenerate the light-absorbing pigment, and uses melanin to absorb stray light that photoreceptors didn’t capture, reducing glare and scattering. The other layers have different roles: the choroid beneath supplies blood but isn’t the outermost retinal layer, the neural retina is the light-detecting tissue itself, and the sclera is the eye’s tough outer coat.