(While super-sensitive rod cells allow us to see when it's near dark, cone cells are responsible for colour vision. Did you know there are 120 million rods and 7 million cones — in each eye?)

(While super-sensitive rod cells allow us to see when it's near dark, cone cells are responsible for colour vision. Did you know there are 120 million rods and 7 million cones — in each eye?)

(While super-sensitive rod cells allow us to see when it's near dark, cone cells are responsible for colour vision. Did you know there are 120 million rods and 7 million cones — in each eye?)

(A common eye condition in which one can see closer objects clearly, but objects farther away are blurry.)

(A common eye condition in which one can see closer objects clearly, but objects farther away are blurry.)

(A common eye condition in which one can see closer objects clearly, but objects farther away are blurry.)

(The pupil controls how much light should strike the retina.)

(The pupil controls how much light should strike the retina.)

(The pupil controls how much light should strike the retina.)