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According to the American Optometric Association, Computer Vision Syndrome, also referred to as Digital Eye Strain, describes a group of eye and vision-related problems that result from prolonged computer, tablet, e-reader and cell phone use. Many individuals experience eye discomfort and vision problems when viewing digital screens for extended periods. The level of discomfort appears to increase with the amount of digital screen use.
To help alleviate digital eye strain, follow the 20/20/20 rule; take a 20-second break to view something 20 feet away every 20 minutes.
The most common symptoms associated with Computer Vision Syndrome (CVS) or Digital Eye Strain are:
eyestrain
headaches
blurred vision
dry eyes
neck and shoulder pain
These symptoms may be caused by:
poor lighting
glare on a digital screen
improper viewing distances
poor seating posture
uncorrected vision problems
a combination of these factors
The extent to which individuals experience visual symptoms often depends on the level of their visual abilities and the amount of time spent looking at a digital screen. Uncorrected vision problems like farsightedness, astigmatism, eye coordination abilities and presbyopia, can all contribute to the development of visual symptoms when using a computer or digital screen.
Many of the visual symptoms experienced by users are only temporary and will decline after stopping computer work or use of the digital device. However, some individuals may experience continued reduced visual abilities, such as blurred distance vision. If nothing is done to address the cause of the problem, the symptoms will continue to recur and perhaps worsen with future digital screen use.
Prevention or reduction of the vision problems associated with Computer Vision Syndrome or Digital Eye Strain involves taking steps to control lighting and glare on the device screen, establishing proper working distances and posture for screen viewing, and assuring that even minor vision problems are properly corrected.

Regular eye examinations and proper viewing habits can help to prevent or reduce the development of the symptoms associated with Computer Vision Syndrome (CVS) or Digital Eye Strain.