- Eye strain arises from excessive effort of the eye muscles when focusing on screens or performing prolonged precision tasks.
- It manifests through symptoms such as dry eyes, headaches, blurred vision, and a general feeling of heaviness in the eyelids.
- Prevention is based on optimizing workplace ergonomics, using blue light filters, and adopting active breaks.
These days, we spend an absurd amount of time glued to screens, whether for work, studies, or simply leisure. This habit has forced our eyes, which evolved to observe the horizon and long distances, to focus on very close objects for hours, which ultimately takes its toll in the form of fatigue and constant discomfort.
Many people get confused and think they have eye strain or presbyopia, but they're not the same thing. While presbyopia is a natural age-related process where the lens loses elasticity, eye strain or asthenopia can affect anyone, regardless of age, simply from overloading the eye muscles and not giving them the rest they need.
How can you tell if you have eye strain?
Not everyone experiences the same thing, but there are clear signs that your eyes are crying out for help. The most common symptoms are red, itchy, or burning eyes , as if you had grit in them. Dryness is also very common, sometimes leading to excessive tearing as the eye tries to compensate for the lack of lubrication.
On a cognitive level, you may experience blurred or double vision when trying to focus after prolonged reading, as well as headaches located in the forehead or around the eyes. Some users even experience nasal congestion or a heaviness in the eyelids that makes it difficult to keep their eyes open , directly impacting concentration and daily performance.
Main causes of eye strain
The most obvious culprit is the intensive use of electronic devices. When we concentrate, we blink much less (going from about 22 times per minute to barely 5 or 13), which evaporates the tear film and leaves the eye exposed. Furthermore, the blue-violet light from screens can cause visual stress that, in the long run, is not exactly healthy for the retina.
But it's not all the phone's fault. Poor lighting , whether due to excessive darkness or direct sunlight on the screen, forces the eyes to work twice as hard. Similarly, uncorrected refractive errors, such as myopia or astigmatism, cause the visual system to overwork in an attempt to sharpen the image, increasing eye strain.
Other contributing factors include stress, lack of sleep, and the environment. Air conditioning, strong heating, and tobacco smoke dry out the surface of the eye , worsening irritation. Even some medications, such as antihistamines, can reduce tear production and leave us more vulnerable.
Effective strategies for reducing fatigue
To combat this problem, the first step is to apply the famous 20-20-20 rule : every 20 minutes, look away at an object about 6 meters away for at least 20 seconds. This simple action allows the focusing muscles to relax and breaks the cycle of constant tension.
Environment optimization and ergonomics
- Screen adjustment: The monitor should be at a distance of between 50 and 70 cm, with the top slightly below eye level (about 10-15 degrees) to avoid dryness.
- Light management: It is essential to avoid reflections. Ideally, windows should be placed to the side of the screen, never in front of or behind it. It is recommended to use warm indirect lightingavoiding harsh fluorescent ceiling tubes.
- Device Configuration: Adjusting the brightness to match the room's brightness and increasing the text size prevents us from having to strain our posture or eyes.
Personal care habits
It's vital to make a conscious effort to blink more frequently to keep the cornea hydrated. If the environment is very dry, using artificial tears can be a great help in relieving the burning sensation. It's also advisable to drink plenty of water and maintain a balanced diet that promotes eye health.
Regarding vision correction, it's essential to see an ophthalmologist at least once a year. A comprehensive examination will determine if you need reading glasses or contact lenses with specific blue light filters, which are much more comfortable than contact lenses when working on computers, as the latter tend to dry out the eyes more.
Practical exercises to relax your eyes
When your eyes feel like they can't take any more, you can dedicate a few minutes to a relaxation routine. A simple technique is to close your eyes for 30 seconds to rehydrate them or apply gentle pressure with your fingertips to your eyeballs to stimulate the intraocular fluid.
To improve flexibility, you can move your eyes horizontally and vertically without moving your head, or try tracing circles or the number 8 with your gaze. This helps stretch the optic nerve, which often becomes stiff after hours of focusing. Applying cold compresses or a damp towel to your eyelids is also very effective in reducing swelling and cooling the area.
Another useful trick is to look at a white wall without focusing on any particular point; this allows the brain and eye muscles to enter a state of rest , preventing the onset of migraines caused by eye strain.
The impact on young people
Children are especially vulnerable due to the early use of tablets and mobile phones. In addition to fatigue, there is a direct correlation between excessive screen time and an increase in childhood myopia , as they spend less time outdoors. Blue light can also disrupt their circadian rhythms, affecting sleep quality and overall development.
Taking care of our eye health requires a balance between technology and rest. Incorporating regular breaks, optimizing the lighting in our environment, and not ignoring symptoms through regular checkups is the only way to ensure our vision remains sharp and healthy despite the demands of the digital world.
