- Computer vision syndrome causes eye strain and dryness due to focusing effort and reduced blinking.
- Blue light from screens disrupts sleep cycles and can cause retinal irritation.
- Applying the 20-20-20 rule and adjusting distance and brightness are key to preventing eye damage.
These days, it's practically impossible to live without a smartphone by our side. We've become accustomed to checking social media, answering emails, or simply browsing the internet anytime, anywhere, even lying in bed before falling asleep. However, this common habit is taking its toll on our eyes, causing a feeling of heaviness that more and more people are noticing in their daily lives.
Many people worry about whether using these screens can cause blindness or irreversible damage. While the good news is that they don't cause permanent vision loss , they do generate a number of rather bothersome temporary discomforts that, if not managed properly, can affect our quality of life and the performance of our eye health.
What really happens to our eyes when we use a mobile phone?
When we spend hours glued to a screen, we suffer from what experts call computer vision syndrome . This happens because our eyes have to make a huge muscular effort to focus on objects that are very close for extended periods, which ends up exhausting the eye muscles.
A key factor is blinking. We normally blink about 15 to 20 times per minute, but when we're engrossed in our phones, this number drops drastically to 5 to 7 times . Not blinking enough means the surface of the eye isn't lubricated, leading to irritating dryness and, sometimes, a gritty feeling.
Furthermore, we cannot forget the blue light emitted by devices . This light has a short wavelength that scatters more and doesn't focus well on the retina, increasing eye strain. It not only tires the eyes but also tricks our brain into thinking it's daytime, interfering with melatonin and causing insomnia or poor sleep quality.
Common symptoms of digital eye strain
The effects vary from person to person, but there are very clear signs that you've overdone it with your phone. The most common symptom is blurred or double vision , which appears after prolonged exposure and makes it difficult to concentrate. Intense itching, redness, and involuntary tearing due to corneal irritation are also common.
Often, the discomfort isn't limited to the eyes. Many people experience frontal headaches and tension in the neck, shoulders, and back due to the hunched posture we adopt when looking at screens, especially when lying down.
In more specific cases, contact lens wearers may notice that their lenses dry out much faster , as the lack of blinking accelerates the evaporation of the liquid on the lens, causing constant discomfort that may force them to remove the lenses prematurely.
How to protect your eyesight and avoid eye strain
To combat these effects, there are simple tricks anyone can use. One of the most effective is the 20-20-20 rule : every 20 minutes of screen time, you should rest your eyes for 20 seconds by looking at an object about 6 meters (20 feet) away. This allows your eye muscles to relax and return to their natural state.
- Brightness and contrast adjustment: The screen should not be brighter than the room light. If there is too much of a difference, the eye has to work twice as hard.
- Font size: Don't strain your eyes trying to read tiny letters; increase the font size in your phone's settings or WhatsApp.
- Safety distance: Keep the device at a distance of between 30 and 40 centimeters. Using it at less than 20 cm significantly increases the risk of eye strain and can worsen nearsightedness.
- Ambient lighting: Avoid using your phone in total darkness. Having a dim light in the room prevents the contrast from being so harsh on your retina.
If you spend many hours working in front of screens, consider using blue light filtering glasses or your device's night mode. These tools reduce light scattering and make reading more comfortable, preventing those common headaches.
Technology and additional tips
Not all screens are created equal. OLED and AMOLED technologies are generally less harsh on the eyes than LCDs, as they manage contrast better and emit less blue light. If you're looking for the healthiest option for extended reading, e-ink e-readers are the best choice, since they don't emit light directly into your eyes.
For those who suffer from chronic dryness, using artificial tears can be a great relief in keeping the cornea hydrated. Likewise, it's vital to avoid glancing at your phone while lying down, and instead focus on the screen with both eyes to prevent imbalances in focus.
Maintaining a healthy eye care routine also involves visiting an optometrist or ophthalmologist at least once a year. There's no need to wait until your vision deteriorates to get a checkup; prevention is the best way to ensure our eyes can keep up with the pace of the digital age without suffering the consequences.
Taking care of our eye health requires small changes in daily habits, such as consciously blinking, adjusting ambient lighting, and respecting rest periods to avoid irritation and muscle fatigue. Prioritizing the correct viewing distance and reducing exposure to blue light before bed will allow us to enjoy technology without compromising our visual well-being or the quality of our sleep.