What is computer vision syndrome?

The National Institute for Occupational Safety and Health (NIOSH) defines computer vision syndrome (CVS) as "eyestrain associated with prolonged computer use." The American Optometric Association (AOA) expands on this definition, calling CVS "eye and vision-related problems related to near work which are experienced during or related to computer use."

Symptoms of computer vision syndrome fall into three categories: vision problems, eye problems, and general discomfort:
Vision problems

Vision problems can include blurred vision (both near and far), difficulty changing focus, double vision, glare, flickering sensations, and temporary changes in color perception.
Eye problems

Eye problems can include redness, burning sensation, soreness, stinging, itchiness, dryness, excessive tearing, eye fatigue, eyestrain, light sensitivity, and contact lens discomfort.
General discomfort

General discomfort symptoms can include headaches, neck tension or pain, shoulder tension or pain, back pain, pain in arms or wrists, excessive fatigue, irritability, and drowsiness.