Apparently the retina of humans covers about 65% of the surface of the interior of our eyes. But most light is focused around the fovea centralis and if it isn't focused around there, we lose resolution. I understand that at night it's better not to focus too close to the fovea centralis but still, I see no way that light somehow ever reaches maybe 40% or 50% of cone and rod cells. Am I missing something? Why do we have a so large retina?