Which term marks the boundary between the fovea and parafovea?

Which term marks the boundary between the fovea and parafovea?

• A. Fovea
• B. Clivus
• C. Foveola
• D. Ora serrata

Answer: (B)

The boundary between the fovea and parafovea is defined by the edge of the fovea centralis. The fovea is the central pit of the macula with a high density of cones and a thinning of inner retinal layers; just beyond it, the parafovea begins as those inner layers reappear and photoreceptors mix with rods. The tiny central area within the fovea is called the foveola, which sits inside the fovea, while the ora serrata marks the outer, peripheral edge of the retina and is not related to this boundary. Clivus is a skull-base term and has no role here.

The boundary between the fovea and parafovea is defined by the edge of the fovea centralis. The fovea is the central pit of the macula with a high density of cones and a thinning of inner retinal layers; just beyond it, the parafovea begins as those inner layers reappear and photoreceptors mix with rods. The tiny central area within the fovea is called the foveola, which sits inside the fovea, while the ora serrata marks the outer, peripheral edge of the retina and is not related to this boundary. Clivus is a skull-base term and has no role here.