transmits visual information from the retina to the brain.

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Biology Online(2001) Physiological processes, http://www.biology-online.org/dictionary/Physiological_processes

Wilipedia (m.d) optic nerve, http://en.wikipedia.org/wiki/Optic_nerve

(2008)Reading as a Physiological Process, Lesson 3, Developmental reading, ... pp.13-14

Villanueva, A. S. and Delos Santos R(2008)Reading as a Cognitive Process, Lesson 4, Developmental reading, ... pp.17-19