(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
The result is a text that is more focused and about 50 pages shorter ..... At one 
time, nearly all of these moths were a mottled light gray color, .... A re" ex is not, 
as is so often thought, a particular kind of behavior, such as an eye blink.