Fact 1: When light enters the eye through the pupil , that light falls on the retina.

Fact 2: Pictures are formed on the retina, and are then transmitted by the optic nerve to the brain.

Given the two facts above, answer the question "When light enters the eye through the pupil, what structure transmits information to the brain?" with the following options: 
- an electron lens
 - vision
 - coded genes
 - iris
 - optic nerve
 - Neuron.
 - nerves
 - aperture


 

     optic nerve    