A recent study has found a strong connection between prolonged screen exposure and the rising rates of nearsightedness, especially among children and young adults. As digital devices become more embedded in everyday life, researchers are urging people to be more mindful of their screen habits to safeguard their long-term vision.
Key Highlights:
- Keeping daily screen time under one hour could significantly lower the risk of developing vision problems, according to the study.
- For every additional hour spent in front of screens, the likelihood of developing nearsightedness increases by 21 percent.
- Reducing screen exposure and engaging in more outdoor activities are effective strategies for maintaining healthy eyesight.
If you’ve been searching for a reason to cut down on screen time, mounting scientific evidence now points to a compelling one: your vision. A sweeping new study has linked excessive daily screen exposure to an increased risk of developing myopia, or nearsightedness—a condition affecting a growing number of children and young adults across the globe.
A Global Review of Screen Time and Vision Health
The study, published in JAMA Network Open, pooled data from 45 separate studies involving over 335,000 participants, most of whom were school-age children with an average age of 9. Researchers analyzed how much time these individuals spent on digital devices—smartphones, tablets, computers, and gaming consoles—and compared that to whether they had been diagnosed with myopia or reported worsening eyesight.
The findings revealed a troubling trend: for each additional hour spent on screens per day, the likelihood of developing nearsightedness increased by 21 percent. More concerning still, once myopia had developed, greater screen time was associated with a 54 percent higher chance that the condition would worsen.
“There is an epidemic of myopia across the globe,” said Rahul Khurana, MD, a retina specialist at Northern California Retina Vitreous Associates and associate clinical professor of ophthalmology at the University of California, San Francisco. Although he wasn’t involved in the study, Dr. Khurana emphasized its relevance: “Major contributors to this are increased near vision activities and reduced outdoor time. Increasing smartphone use and near work with them is likely also contributing to this.”
Smartphones and Close-Up Screens May Pose Greater Risk
While the analysis included all types of screen-based activity, many of the studies reviewed focused specifically on the use of smartphones. These devices demand intense close-up focus, which researchers believe may accelerate the development of nearsightedness more than screen types viewed from a greater distance.
According to the data, even one hour per day of screen time showed a measurable effect, raising the risk of myopia by about 5 percent compared to those with less screen exposure. For those with at least four hours of screen time daily, the odds of developing myopia doubled.
Despite the clear pattern, the study was observational and not designed to prove a direct cause-and-effect relationship. Still, the statistical correlation and consistency across studies suggest that digital device use plays a significant role, particularly for younger individuals.
Not All Screens Are Equal
One limitation of the study is its inability to differentiate between types of screen use. Ian Morgan, PhD, a visiting fellow at Australian National University and professor at Sun Yat-Sen University in China, pointed out that viewing distance is a critical variable. While smartphones and tablets are used at very close range, televisions are typically watched from several feet away.
“Previous studies have suggested that television use is not a risk factor for myopia,” Dr. Morgan explained. “This may be because viewing distances are generally longer—commonly around 2 meters [about 6 feet] or more.”
This distinction suggests that while all screen time should be moderated, activities involving close-range visual tasks may be the most problematic for eye health.
The Double Impact of Technology and Indoor Lifestyles
Experts also believe that cultural and technological changes have fueled the growing myopia rates. Dr. Morgan noted that two major shifts—the rise of the internet in the 1990s and the explosion of smartphone use in the 2000s—were both followed by surges in nearsightedness, particularly among millennials and younger generations. At the same time, outdoor play and recreational time in natural light declined.
“I suspect screen time that requires very close distance, like reading books or looking at smartphones, puts you at highest risk,” said Dr. Khurana. “Previous studies have conclusively shown that near vision activities like reading books increase the risk of myopia, and I agree that smartphone use is in this category.”
Prevention Is Possible—and Simple
Although the statistics are alarming, experts say there are clear and manageable steps that families can take to help preserve eye health. The most effective strategy? Encourage more time outdoors.
“Minimize near vision activities that are not necessary and maximize outdoor time,” advised Dr. Khurana. Exposure to natural light and focusing on objects at a distance allow the eyes to relax and develop more normally, especially during childhood and adolescence.
While completely eliminating digital devices is unrealistic in today’s world, developing healthier screen habits can make a real difference. Whether it’s setting daily screen limits, promoting outdoor activities, or taking regular breaks from close-up work, small changes can help mitigate long-term damage.
As the digital age continues to evolve, prioritizing eye health is more important than ever—especially for the next generation.
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