Which statement best describes the role of the retinal pigment epithelium (RPE) with respect to light?

Which statement best describes the role of the retinal pigment epithelium (RPE) with respect to light?

• A. Supports immune function
• B. Absorbs light to prevent backscattering
• C. Stores glycogen
• D. Produces photopigments

Answer: (B)

Absorbing stray light to prevent backscattering. The retinal pigment epithelium is rich in melanin, which acts like a dark filter that soaks up light not captured by photoreceptors. By absorbing this extra light, it reduces reflections from the choroid that would bounce back through the retina, improving image contrast and sharpness. This pigment also helps protect photoreceptors from light-related damage. While the RPE has other roles in eye health and the visual cycle, when it comes to light management, its main job is to prevent stray light from causing glare and blur.

Absorbing stray light to prevent backscattering. The retinal pigment epithelium is rich in melanin, which acts like a dark filter that soaks up light not captured by photoreceptors. By absorbing this extra light, it reduces reflections from the choroid that would bounce back through the retina, improving image contrast and sharpness. This pigment also helps protect photoreceptors from light-related damage. While the RPE has other roles in eye health and the visual cycle, when it comes to light management, its main job is to prevent stray light from causing glare and blur.