'The retina has about 75 to 150 million rods & only about 7 million of these receptor cells'
cones
SCIENCE & NATURE: The retina has about 75 to 150 million rods & only about 7 million of these receptor cells
The retina has about 75 to 150 million rods & only about 7 million of these receptor cells
The retina has about 75 to 150 million rods & only about 7 million of these receptor cells
SCIENCE & NATURE
cones
SCIENCE & NATURE