Foveola

Foveola is a tiny region approximately 0.35 mm in diameter that is located at the very centre of the fovea centralis. It contains only densely packed cones and no rods, no retinal blood vessels, and no inner retinal layers. The foveola therefore provides the sharpest and most precise vision in the retina.

Note: The macula is the larger functional region for central vision, the fovea (or fovea centralis) is the specialized central pit within the macula responsible for maximal visual acuity, and the foveola is the central core of the fovea where visual resolution is highest.

For a detailed description of the differences between macula, fovea centralis, and foveola, please refer to the description of macula here: Differences between macula, fovea centralis, and foveola.