http://ideas.eyeconx.net/story.php?title=what-causes-computer-use-eyestrain Normally, humans blink about 18 times a minute, but studies show we blink half that often while using computers and other digital screen devices, whether for work or play. Extended reading, writing, or other intensive "near work" can also cause eyestrain. To learn more , visit http://www.geteyesmart.org/eye... Tue, 16 Aug 2011 11:53:24 EDT en