(Kelly of the Clue Crew shows an anatomical diagram on the monitor.)  This irregularity in the eye's surface bends the ray of light so that it can't be brought to a single focus, resulting in blurring
[DOC] [TLE] Poem of the Masses - Pangloss Wisdom [PAR] no one can test,this love is feeling ... the light is so bright ... what secrets fall like 
leaves behind your autmn eyes?