EYE, CAPTAIN
'(<a href="http://www.j-archive.com/media/2008-10-20_J_21.wmv">Kelly of the Clue Crew shows an anatomical diagram on the monitor.</a>)  This irregularity in the eye's surface <a href="http://www.j-archive.com/media/2008-10-20_J_21.jpg" target="_blank">bends</a> the ray of light so that it can't be brought to a single focus, resulting in blurring'
astigmatism