These days, it seems we spend more time looking at a screen than looking people in the face. Between our phones, laptops, and tablets, our eyes are subjected to a frenetic, unnatural pace. Eye strain , also called asthenopia or computer vision syndrome, has become the scourge of our time, affecting a large proportion of those who work in offices or spend hours browsing the internet.
The first thing to understand is that this isn't a serious illness that will make you blind, but rather a functional and reversible problem . Basically, it's the result of straining your eyes' focusing mechanisms for too long. In the following paragraphs, we'll break down everything you need to know to prevent your eyesight from suffering and to regain the visual comfort you've lost.
What exactly is eye strain and how does it differ from tired eyes?
We often hear that someone has "pregnancy-related farsightedness" and think it's the same as eye strain, but they're not. Presbyopia is a natural process due to age; the lens loses elasticity and can no longer focus on near objects. Eye strain, on the other hand, can affect anyone, regardless of age, because it occurs when the focusing muscles work overtime without rest.
This feeling of eye strain appears after continuous accommodative effort. For example, when we spend hours reading a book with tiny print or constantly shifting our gaze between a sheet of paper and the monitor, we cause muscle stress that eventually takes its toll in the form of heaviness and discomfort.
Warning signs: How to know if you have eye strain?
Everyone experiences it differently, but some symptoms are practically universal. The most common are a gritty or burning sensation, itching, and mild redness of the eyelids, which is sometimes mistaken for an allergy. It's also very common for the eyes to become watery or, conversely, to experience extreme dryness that causes you to blink excessively.
Not everything happens in the eye itself. It's very common to experience headaches located in the forehead or eye socket area, as well as a noticeable difficulty concentrating. In more severe cases, you may experience blurred or double vision that disappears once you close your eyes and rest for a while, or even feel facial muscle tension from the effort of trying to focus better.
The culprits: Why do our eyes get tired?
The main cause is undoubtedly prolonged close-up work . Our eyes evolved to see the horizon, not to stare at a pane of glass 30 centimeters away for eight hours. Furthermore, when we are highly focused, the brain "forgets" to blink; we go from about 22 times per minute to barely 5 or 13, which causes tears to evaporate and the eyes to dry out.
- Poor lighting: Both lack of light and excessive brightness or annoying reflections force the visual system to work twice as hard.
- Refractive errors: If you have uncorrected myopia, astigmatism, or hyperopia, your eyes are constantly struggling to focus. maintain a clear image.
- Environmental factors: Air conditioning, strong heating, and tobacco smoke create dry environments that irritate the cornea.
- Blue light: The screens emit a short wavelength that can damage the retina and disrupt our sleep cycles.
A practical guide to reducing eye strain
To combat this problem, you don't need magic, but rather to adopt simple yet consistent habits. The master trick is the 20-20-20 rule : every 20 minutes, look away from the screen and focus on an object about 6 meters (20 feet) away for at least 20 seconds. This allows the internal eye muscles to fully relax.
Workspace Optimization
Ergonomics isn't just for your back; it's also for your eyes. Ideally, you should position your monitor between 50 and 70 centimeters away , ensuring that the top of the screen is at eye level or slightly below (about 10 to 20 degrees). This way, your eyelid covers more of your eye, reducing tear evaporation.
As for lighting, avoid harsh contrasts. Make sure there isn't a window directly behind you that creates reflections on the glass, or an overly bright overhead light. Indirect lighting is preferable , and if possible, prioritize natural light, as long as it doesn't dazzle you directly.
Direct care and healthy habits
Don't forget to blink consciously; try closing your eyes completely several times every so often to hydrate the surface of your eyes . If the environment is very dry, a humidifier in the office or the use of artificial tears (provided they are lubricating and not eye-whitening drops) can make a difference.
If you spend all day glued to a computer, consider using blue light filtering or anti-reflective glasses, which minimize glare and eye strain. Likewise, maintaining a balanced diet, drinking plenty of water, and getting enough sleep are vital, as nighttime rest is when the eyes regain their balance and lubrication.
Special cases: Driving and children
It's not just screens that cause eye strain. Driving long distances, especially at night or in bad weather, requires sustained focus that can tire your eyes. In these situations, it's essential to wear appropriate sunglasses and avoid direct airflow from the fan towards your face to prevent dry eyes.
In the case of young children, the overuse of tablets and mobile phones is causing a surge in cases of childhood myopia . It is crucial to encourage them to spend time outdoors and limit device use before bedtime, as blue light can disrupt their circadian rhythm and affect the quality of their sleep.
When is it time to go to the doctor?
Although most of the time blurred vision can be resolved by adjusting the lighting and resting, there are signs that shouldn't be ignored. If you notice that blurred vision persists, you have chronic headaches , or dry eyes that don't improve with artificial tears, it's time to see an ophthalmologist. A comprehensive eye exam can reveal that you need custom-made corrective lenses or detect more serious conditions such as glaucoma or cataracts.
Regular eye exams, adjusting the ergonomics of our work environment, and taking short breaks are key to preventing eye strain from affecting our productivity and well-being. Keeping our eyes hydrated, controlling lighting, and avoiding excessive close-up work will allow us to enjoy clear and healthy vision in the long run.