Computers, tablets and smartphones are now essential tools, both at work and in private life. Our view, however, may be affected by the hours spent in front of the screen. Dr.. Gustavo Brusasco, expert in Ophthalmology in Turin , gives us some tips to take more care of our eyes
1) Mobile phones and computers can harm your eyes?
Prolonged use of these devices may cause visual disturbances. People using them for personal reasons and work, often complain tired eyes, double and / or blurred vision, burning, tearing or dry eye.
Some studies suggest that about 90% of people using cell phones and computers for more than 4 hours a day suffer from these symptoms. Attendance is so much on the rise that we speak of a real syndrome, the Computer Vision Syndrome (CVS).
2) What is the Computer Vision Syndrome?
To Computer Vision Syndrome it is characterized by an overlap of eye problems, visual and postural that tends to occur in people who have inadequate visual skills to support an extended use of the PC too.
The symptoms of this syndrome can be grouped into two groups:
- Symptoms interior: burning, irritation, tearing and peeling.
- External symptoms: eyestrain, headaches, eye pain, double vision, blurring. These symptoms are usually associated with visual problems (refractive, accommodative and binocular).
An incorrect visual problem increases the frequency of symptoms related to CVS. Sightedness or myopia beds must be to reduce the accommodative stimulus and blurring the image. Moreover, one must pay to 'astigmatism attention, which significantly increases the symptoms while using the computer.
3) What causes blurred vision after using the computer?
Blurry vision from near or far away after prolonged computer use is a common symptom in patients with CVS. It is caused by inadequate accommodative response while using the PC, or by insufficient accommodative relaxation when the subject looked away from the screen.
When an error is detected accommodative, visual performance can significantly improve if the issue is adequately treated, with corrective lenses or with exercises for enhancing visual abilities.
4) Lighting is important when working at the computer?
Inadequate lighting of the workstation is a risk factor for the CVS. Excessive illumination of the area surrounding the screen determines to greater difficulty in reading the characters, in addition to an increase of the possible reflections and glare. This condition can promote the occurrence of a visual fatigue.
The first tip is to set consistent illumination across the field of vision around the monitor, with light sources not too intense and avoiding neon. The windows are equipped with blinds or curtains so as not to leak too much light or, if this is not possible, you must move the workstation.
It is important to position the screen at a distance of between 40 and 100 cm and at a height that allows the vision while maintaining the visual axis inclined of about 10-15 ° downward (the top of the screen must be of little to below the line of sight).
An important strategy to prevent CVS is represented finally by managing breaks: short but frequent breaks can significantly reduce the symptoms of those who work at the computer.
5) You should wear lenses when working at the computer?
The use of a well-calibrated eyewear remains the best tool for the reduction of CVS. The studios lenses can be a good solution if the addition is supplied less than 0.75 to 1.00 diopters, as they provide an excellent field of vision, a clear vision range wide enough and not induce the recruitment of forced postures.
The depth of field lenses (also called employment or Office lenses) are also an intelligent solution, specifically designed to improve vision at the screen and objects placed at 2-3 meters. These lenses present in the upper portion a positive power less than that of the lower portion, allowing both a comfortable viewing of the PC through the middle to upper area of the lens, is a clear vision of the keyboard and the sheets on the desk with the lower portion.
As for the progressive lens, the lens area that allows the sharp vision of the monitor is located in the lower part. Those using it, therefore, is forced to assume awkward postures, tilting the head backward. Even bifocals are inadequate for those who work at the PC, since they require a visual axis tilted down at least 20 ° to obtain a clear vision of close objects, a condition incompatible with the office work.
6) Why do those who work at the computer often "dry eye"?
During the use of the computer, the blink rate is greatly reduced: recording, therefore, an increase in the exposure time of the surface and a greater evaporation of the tear fluid. To solve this kind of problem is indicated the use of tear substitutes, selected by Ophthalmologist in relation to the patient's tear characteristics.
Editor Karin Moscow