Vision Health Library
Too Much Screen Time: Digital Eye Strain, Dry Eyes and Healthy Screen Habits
Computers, smartphones, tablets and televisions have become part of everyday life for adults and children alike. Screens are useful for work, school, communication and entertainment, but spending long periods focused on a digital device can leave the eyes tired, dry and uncomfortable.
The symptoms associated with prolonged screen use are commonly referred to as digital eye strain or computer vision syndrome. While screen use does not normally damage the eyes, it can produce temporary symptoms that become increasingly uncomfortable when breaks are not taken.
What Is Digital Eye Strain?
Digital eye strain describes a group of symptoms that can develop after prolonged use of computers, phones, tablets and other digital devices.
Common symptoms may include:
- Tired or sore eyes
- Dryness
- Burning or irritation
- Blurred or fluctuating vision
- Headaches
- Difficulty focusing
- Neck and shoulder discomfort
These symptoms are generally temporary and often improve after the eyes are allowed to rest.
Why Screens Can Make Your Eyes Feel Dry
One of the biggest reasons screen use can contribute to dry eye symptoms is reduced blinking.
People naturally blink less often when they are concentrating on a computer, phone or other close-up task. Some blinks may also be incomplete.
Blinking spreads fresh tears and protective oils across the surface of the eye. When blinking becomes less frequent, tears can evaporate more quickly and the surface of the eye may become irritated.
Screen Time and Meibomian Gland Function
The eyelids contain small oil-producing glands called meibomian glands. These oils help stabilize the tear film and slow evaporation.
Reduced or incomplete blinking during prolonged screen use may contribute to tear-film instability and can make existing dry eye or meibomian gland problems more noticeable.
Patients who already have dry eye disease may therefore notice that computer or smartphone use makes their symptoms worse.
Does Blue Light From Screens Damage Your Eyes?
Blue light is part of the visible light spectrum and is produced by the sun, indoor lighting and digital screens.
Despite frequent claims about blue light from computers and phones, current evidence has not shown that the amount of blue light produced by ordinary digital screens causes retinal damage or macular degeneration.
The eye strain people experience after long periods of computer or phone use is primarily related to factors such as prolonged close focusing, reduced blinking, glare, screen position and lighting rather than damage from blue light itself.
Do Blue-Light-Blocking Glasses Prevent Eye Strain?
Blue-light-filtering glasses are widely marketed for computer use, but research has not established that they prevent digital eye strain.
For most people, adjusting screen habits, taking regular breaks and addressing dryness or an outdated eyeglass prescription are more useful ways to improve comfort during prolonged computer work.
Screen Use and Sleep
Although ordinary screen light has not been shown to damage the retina, using bright digital devices late at night can interfere with the body's natural sleep-wake cycle.
Light exposure in the evening can signal the brain to remain alert and may make it more difficult to fall asleep.
Reducing screen use before bedtime, lowering screen brightness and using nighttime display settings may help support healthier sleep habits.
The 20-20-20 Rule
One of the simplest ways to reduce digital eye strain is to give the focusing system of the eyes regular breaks.
The 20-20-20 rule is easy to remember: every 20 minutes, look at something about 20 feet away for at least 20 seconds.
Looking into the distance allows the focusing muscles to relax and gives you an opportunity to blink normally and restore moisture to the eye surface.
Position Your Screen Comfortably
Computer position can affect visual comfort. The screen should generally be placed far enough away that text can be viewed comfortably without leaning forward or squinting.
Positioning the screen slightly below eye level may also help reduce eye and neck strain.
If text is difficult to read, increasing the font size is usually preferable to moving closer to the screen.
Reduce Glare and Adjust Your Lighting
Bright reflections and poorly balanced room lighting can make the eyes work harder.
Adjust the brightness and contrast of your screen so it is comfortable relative to the surrounding room. Repositioning lamps, closing blinds or reducing reflections from windows may also improve comfort.
Remember to Blink
When working at a screen, make a conscious effort to blink completely and regularly.
People who experience dryness may also find that lubricating artificial tears help restore moisture during long periods of computer use.
Contact Lenses and Screen Time
Contact lens wearers may notice dryness and irritation sooner during prolonged screen use because lenses depend on a healthy tear film for comfort.
If contact lenses become increasingly uncomfortable during computer work, wearing eyeglasses for part of the day may provide relief.
Persistent contact lens discomfort should be evaluated to determine whether dry eye, lens fit or another issue is contributing.
Screen Time and Children
Children increasingly use screens for school, entertainment and communication. Digital devices themselves have not been shown to damage a child's developing eyes, but prolonged close-up activity can still contribute to eye strain and dryness.
Children should be encouraged to take regular breaks and spend time doing activities that do not involve close-up screen use.
Outdoor activity is also important. Research has found an association between spending more time outdoors and a lower risk of developing or progressing nearsightedness in children.
Watch for Signs of Vision Problems in Children
If a child repeatedly complains of headaches or tired eyes during reading or computer work, the problem should not automatically be blamed on the screen.
Uncorrected nearsightedness, farsightedness, astigmatism or problems with the way the eyes work together can become more noticeable during prolonged close-up activities.
Squinting, rubbing the eyes, closing one eye or repeatedly losing place while reading may warrant an eye examination.
Simple Ways to Reduce Digital Eye Strain
- Follow the 20-20-20 rule
- Blink frequently and completely
- Keep the screen at a comfortable viewing distance
- Increase text size rather than leaning closer
- Reduce glare and reflections
- Adjust screen brightness to match the room
- Use artificial tears if dryness is a problem
- Take regular breaks from prolonged close-up work
- Reduce screen exposure close to bedtime
When to See an Eye Doctor
Digital eye strain usually improves after taking a break from screens. Symptoms that repeatedly return or continue even after screen use has stopped may have another cause.
Persistent headaches, blurred or double vision, significant dryness, eye pain or difficulty focusing should be evaluated.
At Choice Vision Care & Wellness in Wellington, Florida, Dr. Salvatore DeCanio can evaluate digital eye strain, dry eye symptoms, prescription changes and other vision problems that may become noticeable during prolonged computer or device use.