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Clear vision is something most of us take for granted – until it quietly begins to slip. Text on your phone blurs just enough to be frustrating, street signs don’t snap into focus until you’re almost past them and reading feels more tiring and less enjoyable than it used to be. It’s often easy to blame these changes on stress, screen time or simply getting older, but it’s more likely they’re early signs of a very common – and treatable – vision problem.
Nearsightedness and farsightedness affect billions of people worldwide, yet many don’t fully understand what these conditions are, when they’re diagnosed or how simple treatment can improve daily life. Here’s what to know.
What is nearsightedness?
Nearsightedness, or myopia, is a progressive eye condition in which people “struggle more to see at far range,” says Dr. Sara Weidmayer, a practicing physician at the LTC Charles S. Kettles VA Medical Center in Michigan. “This impacts activities like driving, watching TV or seeing faces across a room.”
The condition is caused by a refractive error, meaning the eye’s focusing system doesn’t bring light to the correct spot. In a healthy eye, light rays focus directly on the retina, the light-sensitive layer lining the back of the eye. But in people with myopia, Weidmayer explains, light focuses in front of the retina, resulting in distant objects appearing blurry and close-up objects being clear.
This often happens because the eyeball is slightly too long from front to back; but other times, the cornea – the clear front “window” of the eye – is too curved. Either way, the eye bends light too strongly to see far away.
Because of this, “many nearsighted people rely on their glasses or contacts most of the day, especially for driving and anything that involves distance vision,” says Dr. Laura Di Meglio, an instructor of ophthalmology at the Wilmer Ophthalmological Institute at Johns Hopkins University School of Medicine.
What is farsightedness?
Farsightedness, also known as hyperopia, is another type of refractive error – but the focusing problem occurs in the opposite direction. In hyperopia, light focuses behind the retina instead of directly on it. This usually happens when the eyeball is slightly too short or when the cornea or lens does not bend light strongly enough.
In practical terms, this means “you’ll struggle more to see at near range without glasses,” says Weidmayer. “This impacts activities like using the computer, reading or doing other near tasks like using handheld devices.”
Complicating matters is that mild hyperopia can be subtle, especially in younger people. That’s because young eyes have flexible lenses that can compensate by working harder to focus. It’s why “many people don’t realize they’re farsighted until their 30s or 40s, when that extra focusing effort becomes harder,” says Di Meglio.
Over time, that constant effort can lead to noticeable eyestrain, headaches or fatigue –particularly after reading, computer work or other close-up tasks.
Is being nearsighted or farsighted more common?
In most parts of the world today, nearsightedness is more common – and its prevalence has risen sharply over the past several decades. Large population studies have documented an increase of more than 60% over three decades, with rates climbing from about 25% in the early 1970s to more than 40% by the early 2000s. The rise has continued so sharply that some projections suggest that by 2050, about half the world could be nearsighted.
Farsightedness also occurs, but much less often. “About three to four people are nearsighted for every one person who is farsighted,” says Weidmayer. Indeed, estimates vary depending on age and how hyperopia is measured, but the National Eye Institute reports that farsightedness affects roughly 5% to 10% of Americans today.
How do I know I need glasses?
“The most obvious sign you need glasses is blurry vision – either up close or far away,” says Di Meglio. You might also notice frequent headaches when reading, a need for brighter light to see words better, closing one eye to sharpen focus or rubbing your eyes more often than usual. “Less obvious symptoms may include squinting, eye strain or fatigue, night glare or haloes or double vision,” adds Weidmayer.
Parents should watch for clues in children as well. “Kids might hold things very close, sit right in front of the TV, avoid reading or have trouble paying attention in class,” says Di Meglio.
If any of this sounds familiar for you or someone in your care, the next step isn’t guessing, “it’s getting an eye exam,” offers Weidmayer.
During a comprehensive eye exam, an eye care professional can measure how your eyes focus light, determine whether you need glasses or contact lenses and assess overall eye health to detect conditions such as glaucoma, cataracts or retinal disease. This not only helps prevent complications that can develop silently over time, but also ensures you’re seeing as clearly and comfortably as possible.
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