The human visual system is complex and amazingly adaptive. It can change focus to see objects both near and far. It can change to see in bright conditions or dark conditions. With the help of 140 million neurons in the visual cortex it can identify, classify, analyze and react to approximately 12 to 15 one-million-point images per second. Yet, despite this complexity, human eyes just don't handle extended computer screen viewing all that well. "Your eyes are happiest when used for a variety of tasks utilizing a variety of focal distances with a variety of properly aligned light sources," states Jeffrey Anshel, O.D., author of Visual Ergonomics in the Workplace. "Computer use provides none of the above."
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