Copyright 2004 Ken Greenebaum
Fovea
nMost of retina is
photosensitive
nFovea
nSmall region at center
of visual axis
nSubtends less than 2° of visual angle
nContains only cones
n(densest concentration of cones on retina)
n≈147,000 Cones per mm2
nContrast to hawks with ≈1,000,000 receptors per mm2