FROM THE NECK UP
'(<a href="http://www.j-archive.com/media/2008-12-09_DJ_11.jpg" target="_blank">Jon of the Clue Crew shows an anatomical diagram and a micrograph on the monitor.</a>)<br />The retina has a blind spot, the optic disk, where the optic nerve exits from the eyeball; it's not sensitive to light, because it doesn't have <a href="http://www.j-archive.com/media/2008-12-09_DJ_11a.jpg" target="_blank">these</a> two types of photoreceptor nerve cells found in the rest of the eye'
rods and cones