A small depression or pit, especially the central pit in the retina of the eye where vision is sharpest.
From Latin 'fovea' meaning 'pit' or 'ditch', from the root relating to digging. The anatomical term was applied to the eye depression because of its pit-like appearance.
Your fovea is smaller than a grain of rice but contains over a million cone cells packed impossibly tight—it's why you have to look directly at something to see fine details, not from the corner of your eye.
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