Myopia is nearsightedness. If you have myopia, close-up objects appear clear while things farther away look blurry or fuzzy. It’s one of the most common vision problems in the world, currently affecting roughly a third of children and adolescents globally, and that number is climbing.
Why Myopia Makes Distance Vision Blurry
In a normally shaped eye, light passes through the cornea and lens and focuses directly on the retina at the back of the eye. In myopia, the eyeball is slightly too long from front to back, or the cornea curves too steeply, or both. Either way, the result is the same: light focuses at a point in front of the retina instead of on it. That’s why nearby objects still look sharp (the light from close objects naturally focuses farther back) but distant objects appear blurred.
Farsightedness, or hyperopia, is essentially the opposite problem. The eyeball is too short or the cornea too flat, so light focuses behind the retina. People with hyperopia see distant objects more clearly and struggle with things up close. The two conditions are sometimes confused because both involve blurry vision, but they affect opposite ends of the distance spectrum.
How to Spot It on a Prescription
If you’ve ever looked at an eyeglasses prescription and wondered what the numbers mean, the sign in front of the number tells you everything. A minus sign (−) indicates nearsightedness. A plus sign (+) indicates farsightedness. So a prescription reading −2.50 means you have myopia, while +2.50 means hyperopia. The higher the number, the stronger the correction your eyes need.
Common Symptoms
The hallmark of myopia is that faraway objects look blurred or fuzzy while close items appear clear. Beyond that, you may notice headaches, eye strain, and squinting, especially when driving, playing sports, or looking more than a few feet away. Tiredness after sustained distance viewing is also common.
In children, myopia can be harder to catch because kids often don’t realize their vision isn’t normal. Warning signs include poor school performance, a shortened attention span, and holding books or screens unusually close to the face. Children who squint frequently or sit very close to the TV may be compensating for blurry distance vision without knowing it.
What Causes Myopia
Genetics play a major role. If one or both parents are nearsighted, children are significantly more likely to develop myopia. But genes alone don’t explain the sharp rise in myopia rates over recent decades. Environmental factors, particularly how much time children spend outdoors, appear to be a key piece of the puzzle.
Research suggests that outdoor light exposure sends signals through the retina that help regulate eye growth during childhood. Getting at least two hours of outdoor time per day appears to delay the onset of myopia in children who haven’t yet developed it. Importantly, outdoor time doesn’t seem to slow myopia that has already started, so early habits matter. Extended close-up work like reading, homework, and screen time is also associated with higher rates of nearsightedness, though the outdoor light connection appears to be more significant than screen time alone.
A Growing Global Problem
Myopia prevalence among children and adolescents has risen steadily, from about 24% in 1990 to nearly 36% by 2023. Projections estimate it will reach roughly 40% by 2050, translating to more than 740 million cases worldwide in that age group alone. The trend is especially pronounced in East and Southeast Asia, where some urban populations see rates above 80% in young adults. Urbanization, more time spent indoors, and increased educational demands are all considered contributing factors.
Risks of High Myopia
Mild myopia is mostly an inconvenience corrected with glasses or contacts. High myopia, however, carries real long-term health risks. Because the eyeball is physically elongated, the retina is stretched thinner, making it more vulnerable to damage over a lifetime.
People with high myopia face substantially higher odds of retinal detachment, where the retina pulls away from the back of the eye. One large analysis found that the likelihood of retinal detachment climbed from about 3 times higher with low myopia to more than 12 times higher with high myopia. The risk of degenerative changes in the macula (the central part of the retina responsible for sharp vision) jumps even more dramatically, reaching over 800 times higher in people with high myopia compared to those without it. These retinal complications also significantly increase the risk of developing glaucoma, with some complications nearly tripling to sixfold the odds.
This is why controlling myopia progression in childhood, before it reaches high levels, has become a major priority in eye care.
Slowing Myopia Progression in Children
Standard glasses and contacts correct blurry vision but don’t prevent the eye from continuing to elongate. Over the past decade, several treatments have been developed specifically to slow that progression in children.
- Specialty eyeglass lenses: Lenses like Essilor’s Stellest design use a ring of small lenslets to alter how light hits the peripheral retina. A clinical trial showed they reduced myopia progression by 71% and eye elongation by 53% over two years.
- Orthokeratology (ortho-K): Rigid contact lenses worn overnight gently reshape the cornea so children see clearly during the day without glasses. Studies show ortho-K can reduce myopia progression by approximately 50 to 60%.
- MiSight contact lenses: These are the first FDA-approved contact lenses designed to slow myopia progression in children. They use a dual-focus design that corrects distance vision while simultaneously sending signals to slow eye growth.
- Multifocal contact lenses: Center-distance multifocal lenses, when worn at least five hours a day over a period of years, can also help slow eye elongation.
- Low-dose atropine eye drops: Clinical trials, primarily in Asia, have shown that very low concentrations of atropine drops can slow progression. Results in Western populations have been more mixed, and the FDA has not yet approved a formulation for this use in the United States.
These treatments work best when started early, while the eye is still growing. Most myopia progression happens between ages 6 and 16, so that window is when intervention has the greatest impact. None of these approaches cure myopia or reverse elongation that has already occurred. They reduce how much worse it gets.
Correcting Myopia in Adults
For adults whose myopia has stabilized, the options are straightforward. Glasses and contact lenses remain the most common correction. Refractive surgery, including LASIK and PRK, reshapes the cornea to shift the focal point back onto the retina. These procedures work well for mild to moderate myopia. People with very high myopia may be candidates for implantable lenses that are placed inside the eye in front of the natural lens.
Regardless of correction method, adults with moderate to high myopia should have regular dilated eye exams to monitor for retinal changes, since the structural elongation of the eye persists even after vision is corrected.