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Digital Eye fatigue, or DEF, is a disorder created by gazing at a digital image for too long a time. The ocular muscles constantly flex to refocus perceived distance. Unfortunately, the perceived distances in a 3D landscape projected on a 2D display system, are not physically further away. Additionally, the eye focuses on the hard edge of an image, but digital images don't have a clean edge. As a result, the focus drifts forward and back, causing eye fatigue.

This results in the eye?s muscular systems constantly correcting themselves against natural behaviour, and additional processing overhead for the brain as data that should be in focus, is not.

Dry eyes, blurry vision and headaches are among the persistent symptoms that represent DEF, and continue for significant periods after cessation of use of a digital display.

See Also: Computer Vision Syndrome

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