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Computer Vision Syndrome

What is Computer Vision Syndrome?

Computer Vision Syndrome (CVS) is a group of eye and vision related problems caused due to excessive, uninterrupted focusing of the eye on the computer screen or smartphones for an extended period of time.

According to the National Institute of Occupational Safety and Health, CVS affects about 25-90% of the people who spend three hours or more a day at a computer or smartphone screen.

What causes or aggravates Computer Vision Syndrome?

Viewing a computer screen is different than reading a printed book as many a times the screen resolution is not optimum and characters are not sharp. Along with presence of glare, viewing angle and reflections makes viewing the screen complicated and difficult and makes the eye work harder.

The following conditions aggravate Computer Vision Syndrome:-

1.Vision problems like hyperopia - short sightedness in young and presbyopia in old which when uncorrected leads to increased straining.
2.Improper or poor lighting
3.Faulty angle of gaze of viewing the monitor
4.Glare on the computer screen, monitor type (cathode ray v/s plasma)
5.Poor seating posture

Do I have CVS? (Signs and Symptoms)

The problems and symptoms of Computer Vision Syndrome increase with the duration of uninterrupted computer use.

The common symptoms are:
1.Eye strain
3.Blurred vision
4.Neck and shoulder pain
5.Dry eyes
7.Difficulty focussing eyes
8.Burning and stinging sensation
9.Photophobia or increased sensitivity to light

How is Computer Vision Syndrome diagnosed?

Diagnosis begins with simple eye tests to determine visual acuity and refraction tests to determine lens power for correction if any abnormality like farsightedness (myopia), near sightedness (hyperopia) or presbyopia is found.

Also a detailed history to find out any environmental or health related issues which may aggravate CVS.

How is CVS treated?

Treatment for Computer Vision Syndrome is simple and includes regular eye care and changes in how you view the computer screen.
•Eyeglasses for computer use may be prescribed even in those who may have a normal vision for day to day activities. Those with glasses having Computer Vision Syndrome may need correction to adjust for optimal computer viewing. Special lens design, power, tints or coating may be used to help maximise viewing comfort.
•Visual training may be beneficial in those who have difficulty focusing or maintaining eye coordination, which cannot be corrected with glasses. It trains the eye and brain to work together more efficiently. This training or simple and can be done at home or office.

Viewing the computer in the appropriate way is the best method to prevent or reduce the symptoms of Computer Vision Syndrome.



This includes: -

1.The computer screen should be 20-15 degrees below eye level. And 20-30 inches from the eye.
2.Taking breaks from computer screen for 15 mins after every 2 hours of continuous computer use.
3.The material for reading should be located above the keyboard and below the monitor so that you do not move your head to look from the screen to the document.
4.Using measures like low voltage bulbs, anti-glare screens to avoid any light reflecting from the screen and thus glare.
5.Proper sitting position and a comfortable chair. Your arms should not rest on the keyboard but on the arm rest while typing.
6.Frequent blinking to prevent dry eyes.