Often the letters on the computer or handheld device are not as precise or sharply defined, the level of contrast of the letters to the background is reduced, and the presence of glare and reflections on the screen may make viewing difficult. Viewing a computer or digital screen is different than reading a printed page. Uncorrected vision problems can increase the severity of computer vision syndrome (CVS) or digital eyestrain symptoms. As a result, the unique characteristics and high visual demands of computer and digital screen viewing make many individuals susceptible to the development of vision-related symptoms.
Viewing a computer or digital screen often makes the eyes work harder. To help alleviate digital eyestrain, follow the 20-20-20 rule take a 20-second break to view something 20 feet away every 20 minutes. The average American worker spends seven hours a day on the computer either in the office or working from home. The level of discomfort appears to increase with the amount of digital screen use. Many individuals experience eye discomfort and vision problems when viewing digital screens for extended periods.