Computer vision syndrome (CVS) is a condition resulting from focusing the eyes on a computer or other display device for protracted, uninterrupted periods of time and the eye muscles being unable to recover from the strain due to a lack of 7 to 8 hours uninterrupted sleep. Some symptoms of CVS include headaches, blurred vision, neck pain, fatigue, eye strain, dry eyes, irritated eyes, double vision, vertigo/dizziness, polyopia, and difficulty refocusing the eyes. These symptoms can be further aggravated by improper lighting conditions (i.e. glare or bright overhead lighting) or air moving past the eyes (e.g. overhead vents, direct air from a fan).
Therapy
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Asthenopic (eye strain) symptoms in the eye are responsible for much of the severity in CVS. Proper rest to the eye and its muscles is recommended to relieve the associated eye strain. Observations from persons experiencing chronic eye strain have shown that most people who claim to be getting enough sleep are actually not. This, unaware to them, causes the eye strain to build up over a period of time, when if they had simply obtained 7 to 8 hours of un-interrupted sleep, their eye muscles would have recovered during the sleep and the strain would not have built up. Since the lack of sleep has been related to poor food habits, one major recommendation of the therapy is to ensure that the food one eats is properly cooked and contains no burnt parts or particles. Various catch-phrases have been used to spread awareness about giving rest to the eyes while working on computers. A routinely recommended approach is to consciously blink the eyes every now and then (this helps replenish the tear film) and to look out the window to a distant object or to the skyâ€"doing so provides rest to the ciliary muscles. One of the catch phrases is the "20 20 20 rule": every 20 minutes, focus the eyes on an object 20 feet (6 meters) away for 20 seconds. This basically gives a convenient distance and timeframe for a person to follow the advice from the optometrist and ophthalmologist. Otherwise, the patient is advised to close his/her eyes (which has a similar effect) and relax the face and neck muscles for two minutes, at least every half-hour.
Decreased focusing capability is mitigated by wearing a small plus-powered (+1.00 to +1.50) over-the-counter pair of eyeglasses. Wearing these eyeglasses helps such patients regain their ability to focus on near objects. People who are engaged in other occupationsâ€"such as tailors engaged in embroideryâ€"can experience similar symptoms and can be helped by these glasses.
A Pacific University research study of 36 participants found significant differences in irritation or burning of the eyes, tearing, or watery eyes, dry eyes, and tired eyes, that were each improved by filtering lenses versus placebo lenses, but in a follow-up study in 2008, the same team was not able to reproduce the results of the first study.
Competing research has shown blue light-filtering lenses decrease specific aspects of light emissions. Theoretical reductions in phototoxicity were 10.6% to 23.6%. Additionally, melatonin suppression was reduced by 5.8% to 15.0% and scotopic sensitivity by 2.4% to 9.6%. Over 70% of the participants in this testing were unable to detect these changes. The expansion of technology has led to more individuals utilizing computers and televisions which increase the overall exposure to blue light. This has opened up opportunities for companies such as Gunnar Optiks and Razer Inc. to create glasses focused on reducing the exposure to blue light.
Blue light can also be filtered from the computer screen, eliminating the need for blue-light blocking glasses. Companies such as f.lux have applications that filter the amount of blue light based on user preferences and the time of the day.
Dry eye is a symptom that is targeted in the therapy of CVS. The use of over-the-counter artificial-tear solutions can reduce the effects of dry eye in CVS. Prior to using artificial tear solutions, it is necessary to check if dry eye is the actual cause of the problem (measured by a tear meniscus test) or whether there are no actual symptoms of dry eye at all. Dry eyes because of CVS can also be treated using moisture chamber glasses or humidifier machines. Office spaces with artificially dry air can worsen CVS syndromes, in which case, a desktop or a room humidifier can help the eyes keep a healthy moisture level.
At night, CVS can become worse. It is recommended to use a dark user interface while working at night on the computer. Several browser / OS add-ons exist to darken the user interface (www.turnoffthelights.com).
When working on computer screens people tend to blink less which leads to the eyes drying out faster. Reminding people to blink or do blinking exercises is achieved via static reminders (such as eyeleo).
Real-time feedback based blink reminders (such as VisionProtect )actively measure the blinking rate of the user and notify the user via visual / audible alert. The effectiveness of real-time feedback based blink reminder systems is proven in a study by Osamu Fukushima and Masao Saito .
Prevalence
According to the US National Institute for Occupational Safety and Health, computer vision syndrome affects about 90% of the people who spend three hours or more a day at a computer. Another study in Malaysia was conducted on 795 university students aged between 18 and 25. The students experienced headaches along with eyestrain, with 89.9% of the students surveyed feeling any type of symptom of CVS. Americans spend an average of 8 hours a day in front of a screen, whether that be a television screen, phone/tablet, or a computer screen. This has increased the prevalence of individuals affected by computer vision syndrome.
See also
- Asthenopia
- List of repetitive strain injury software (break reminders)
- Photophobia
- Repetitive strain injury
- Presbyopia
- Visual looming syndrome
References
External links
- "Computer Vision Syndrome (CVS)". American Optometric Association. 2017.Â
- AllAboutVision.com page on CVS
- Zheng Yan, Liang Hu, Hao Chen and Fan Lu (September 2008). "Computer Vision Syndrome: A widely spreading but largely unknown epidemic among computer users" (PDF). Computers in Human Behavior. 24 (5): 2026â€"2042. doi:10.1016/j.chb.2007.09.004. CS1 maint: Multiple names: authors list (link)
