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4.1.2 What is Computer Vision Syndrome (CVS)?

Almost the entire world spend their life, work and leisure, with a laptop, how many, days, years of all life the millennials will spend connecting by a screen, for sure will be more than sleeping.

However our eye, as an organ, doesn’t develop to adapt that new life conditions so fast as the scientific evolution.

What initially seemed profession development and the corporate environment, in fact, can result in serious health problems, and concerns health professionals - especially if after work the person uses the laptop again.

This health problem is universal, in that is transversal to all age groups, since they often spend several hours entertained with games, amusements, reading even watching movies.

The diseases and more common symptoms, are, in particular, irritated eyes, redness, pruritus, dry eyes or tearing, fatigue, sensitivity to light, feeling of heaviness in the eyelids or the forehead, difficulty focusing causes headache, stiff neck, back pain and wrists, but  the worst harm of prolonged use of the computer is the damage caused to the vision, because it causes no pain lesions, at least initially.

Among the most recurrent are eye fatigue, blurred vision and dry eye, usually neglected, these symptoms contribute to the "computer vision syndrome", an internationally recognized disease.

According to experts, the disorder can be defined as the set of problems related to the eyes and vision of those who spend hours in front of the computer daily.

There are many professionals and even students who spend hours using the computer, looking directly at the monitor in dry or air-conditioned environments, conditions that cause them to blink less and is that’s the starting point for the next: eye health problems.

Other factors that contribute to the syndrome include the need for the eyes to move in various positions, focus constantly and make movements in and out - convergence and divergence, as:

- The characteristics of the screen, such as distance, resolution, contrast, and brightness should be observed in the prevention of eye diseases. "The better and bigger the screen resolution, the better the eyes."

- For low-format documents, the recommendation is to increase the font size or use the zoom feature to enlarge the font size.

- While the brightness should be adjusted in intermediate terms, neither too nor too intense, the contrast should offer the best possible viewing, also should block pop-ups - those windows (mostly, advertising pieces, which pop up on the screen) that pop up suddenly on the screen with intense colors that interfere with the view.

- Glasses for near and "nearby" are preferable to bifocals. 

- The computer should be installed at a comfortable distance so that the top of the monitor is slightly below eye level and the person can perform his or her activities without exaggeration - physical or ocular.

- Ideally, the whole body as to be kept as comfortable as possible while typing, and listening to the body because the pain is already a good indication that something needs to be changed.

- Drinking water, coffee breaks, or talking with a colleague in the office is very prolific, is the way to give the eyes a break who will blink normally at an ideal frequency. Use the three/20/ rule.

This syndrome, although not directly related to those who suffer from a disorder called dry eye, finds in the patients of this eye disease their preferred victims. Use of artificial tears minimizes symptomatology.

In fact, the probability of being hit by the syndrome is very large, from recent statistics results that more than 70% of computer users suffer from it.

People should be informed of the importance of blinking -  helps prevent the person from focusing and constantly refocusing the eyes; working with a monitor, the most of us tend to blink less often than usual, this happens unconsciously, a less frequent blink is an important cause for the appearance of dry, red, and irritated eyes, the number of blinkers decreases to 30% of normal wax.

Besides the time of use of the equipment, the environment in which the computer is, the way people relate to it and the characteristics of the machine are determinant for the appearance or not of the syndrome, should place approximately 50-70 cm from your screen, the top edge should be at the height of your eyes or slightly below when you are sitting, the computer screen is also a great dust collector and should be cleaned frequently to improve visibility, if necessary, use an anti-glare filter on the computer screen.

The screen should not be facing or facing a window or lamp in order to prevent the eyes from adjusting to different luminous intensities and avoid reflections on the screen.

Set it perpendicular to the window, with the sunlight striking sideways. In addition, the room should be well lit and the computer should never be used with the lights off.

Avoid the incidence of ventilator air or air conditioning directly on the face. 

Use comfortable and preferably adjustable chairs that keep your body in proper posture.

To rest your eyes, every 30 minutes, look at more than 5 meters for a few moments and place your palms in the eyes to keep them in the dark for 10/20 seconds. 

Also, do not forget to flash to lubricate the eye and avoid irritations. Some glasses may be required.

Regular monitoring by the ophthalmologist is important to investigate eye diseases or for a  new glasses prescription.

In short, the demands of today's life affect the human capabilities of the human being, but proportionately it is the quality of the health professionals who accompany and anticipate the social and ergonomic needs for the response and correct adaptability to the living conditions, especially in the working conditions, either through preventive and sensitization actions, for the correct use of the means of work, or for the selection of appropriate therapies for the treatment of each patient.



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PEG Coordinator 2003-2004 e 2009-2010

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