Here's What Happens To Your Eyes, Brain & Heart If You Stare At A Screen For 6+ Hours A Day

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In light of the "digital revolution," we are spending more and more time looking at digital devices than ever before. We now have immediate and unlimited access to information and to one another. The American Optometric Association (AOA) reports that an average American worker spends at least seven hours a day on the computer either in the office or working from home. Other reports indicate that it could be as much as 11 hours each day that the average American adult spends looking at a screen of some kind—including mobile devices like phones.

At the same time, healthy young patients of mine in their 20s, 30s, and 40s are reporting chronic insomnia, brain fog, and short-term memory loss, as well as vision strain and headaches in droves.

While there isn't an abundance of research, a few studies are beginning to emerge. Here's what can happen if you stare at a screen all day.

1. You can develop long-term eye problems.

The American Optometric Association defines CVS—computer vision syndrome—also known as digital eye strain, as a complex of eye and vision problems related to the activities that stress the near vision and that are experienced in relation, or during, the use of the computer, tablet, e-reader, and cellphone. These symptoms can include eye strain and ache, dryness, irritation, redness, double or blurred vision and burning, and even neck and shoulder pain.

2. Phone addiction can rewire your brain.

The effects on your brain are both behavioral and structural.

First, mobile phone addiction is real. A study of students in 10 countries showed the majority feel acute distress if they have to go without their cellphones for 24 hours. Meanwhile, most people are checking their phones at least 150 times a day and sending upward of 100-plus texts.

This problematic use of cellphones has been associated with anxiety, stress, and even depression. These habits are causing what top neuroscientists have called "digital dementia," harming important right-brain functions including short-term memory, attention, and concentration in ways that may or may not be reversible.

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On the structural side, individuals who are perceived as having an online game addiction show significant gray matter atrophy in various areas of the brain (right orbitofrontal cortex, bilateral insula, and right supplementary motor area) once examined on brain MRI studies. These affected areas where volume loss is seen are responsible for critical cognitive functions such as planning, prioritizing, organizing, impulse control, and reward pathways. These areas are also specifically involved in our development of empathy and compassion as well as translation of physical signals into emotion.

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3. Your sleep will suffer without screen-free time before bed.

In 2014 a Harvard Medical School group investigated the biological effects of reading an e-book on a light-emitting device with reading a printed book in the hours before bedtime. They reported that individuals who read on the e-book took longer to fall asleep, had reduced evening sleepiness, reduced melatonin secretion, later timing of their circadian clock, and reduced next-morning alertness than when reading a printed book.

4. You're more likely to be anxious, stressed, or depressed.

While the research to date linking mood and digital device addiction is still emerging, countless numbers of my patients report anxiety, stress and even depression caused by spending too much time scrolling social media feeds. And some even report that "social media detoxes" where they delete apps like Instagram and Facebook from their phones for a few days or weeks drastically improves their sense of well-being.

So, what can you do about these symptoms?

If you find yourself experiencing symptoms like insomnia, short-term memory loss, anxiety, worsening vision, headaches, or brain fog, see your personal doctor for an evaluation first, but then try limiting screen time to six hours per day, avoiding all screens at least one hour before bed and taking the weekends "off" from social media. If you immediately feel better, you have a clear indication of how screens are affecting you.

From there, we should all be asking the bigger question, which is whether our technology serves us, or we are a servant to it, and how tech will affect our health and well-being in the future.

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Robin Berzin, M.D.
Robin Berzin, M.D.
Robin Berzin MD is a functional medicine physician and the founder of Parsley Health. Her mission is...
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Robin Berzin, M.D.
Robin Berzin, M.D.
Robin Berzin MD is a functional medicine physician and the founder of...
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