Nearsightedness affects roughly 30% of the global population, making it one of the most common vision conditions in the world. That number has nearly doubled over the past two decades, and projections suggest about half of all people on Earth will be nearsighted by 2050.
Current Global Numbers
A comprehensive meta-analysis published in the British Journal of Ophthalmology estimated the current global prevalence of myopia (the clinical term for nearsightedness) at 30.47%. The condition has been climbing steadily, from about 24% in 1990 to nearly 36% by 2023. That trajectory shows no signs of leveling off. By 2050, an estimated 740 million children and adolescents alone will be affected.
Roughly one in three American and European adults is nearsighted. But those numbers look modest compared to parts of East Asia, where prevalence among young people reaches 80 to 90%. South Korea, China, Singapore, and Japan have seen especially sharp increases over the past generation. The gap between regions points to a combination of lifestyle factors and genetics driving the condition at very different rates around the world.
Why Rates Are Rising So Quickly
Nearsightedness develops when the eyeball grows slightly too long from front to back, causing distant objects to focus in front of the retina rather than on it. This elongation typically begins in childhood and progresses through the school-age years. A younger age of onset tends to mean more progression over time, which is why the trend toward earlier diagnoses is concerning.
The rapid rise in prevalence is too fast to be explained by genetics alone. Two environmental shifts stand out: children are spending far more time on close-up tasks like reading, homework, and screens, and far less time outdoors. Urbanization plays a role too. Dense urban environments with smaller living spaces and more structured indoor schooling correlate with higher rates across every region studied.
How Outdoor Time Lowers Risk
Bright outdoor light appears to be protective against developing nearsightedness in the first place. A systematic review and meta-analysis found that adding about one extra hour of outdoor time per day reduced the chance of a child becoming nearsighted by roughly 45%. Bumping that up to 76 additional minutes per day yielded a 50% reduction compared to baseline. The exact threshold of outdoor time needed isn’t firmly established, but the pattern is consistent: more time outside during childhood means lower risk of onset.
Importantly, this protective effect applies mainly to preventing nearsightedness from starting. The evidence that outdoor time slows progression once a child is already nearsighted is weaker. Still, the simplicity and low cost of the intervention have made it a central recommendation in public health strategies across Asia, where some schools have added mandatory outdoor recess periods specifically to curb myopia rates.
High Myopia and Serious Complications
Not all nearsightedness carries the same risk. Standard myopia is defined as a prescription of negative 0.50 diopters or beyond. High myopia starts at negative 6.00 diopters, a level of severity that stretches the eye enough to raise the risk of permanent vision damage. About 2.8% of the global population (around 170 million people) had high myopia as of 2010, and that figure is projected to reach 10% by 2050.
High myopia isn’t just an inconvenience that requires thicker lenses. The elongated eye shape increases the risk of retinal detachment, a condition where the light-sensing layer at the back of the eye pulls away from its support tissue. It also raises the likelihood of glaucoma, cataracts, and myopic macular degeneration, a progressive condition that can cause irreversible central vision loss. These complications make high myopia one of the leading causes of uncorrectable blindness worldwide.
Prevalence of high myopia varies by region. Western countries report rates between 1.6% and 4.6%, while Asian populations range from 0.8% to 9.1%, reflecting the same geographic patterns seen in overall myopia but with higher stakes.
The Economic Cost
Vision impairment from uncorrected or undercorrected nearsightedness carries a real economic toll. Global productivity losses from moderate-to-severe vision impairment and blindness (of which uncorrected refractive error is the leading cause) were estimated at $411 billion in 2018, representing about 0.3% of global GDP. Most of that cost, roughly $367 billion, came not from total blindness but from moderate-to-severe vision impairment: the kind of blurry distance vision that keeps people from working effectively or working at all.
In lower-income countries where access to glasses and eye exams is limited, the impact is disproportionately large. A condition that costs a few hundred dollars to correct with lenses can cost economies billions when left untreated at scale.
What to Expect Going Forward
The most widely cited projection, from a landmark analysis by Holden and colleagues, forecasts that roughly 50% of the world’s population will be nearsighted by 2050, with 10% reaching the high myopia threshold. In East Asia specifically, prevalence is projected to climb from about 52% in 2020 to 65% by 2050. Some researchers have questioned the methodology behind these specific numbers, but the overall direction is not in dispute. Every major dataset shows prevalence accelerating, particularly among children and young adults.
For parents, the practical takeaway is straightforward: prioritize outdoor time during childhood, schedule regular eye exams starting in early school years, and take early prescriptions seriously. Catching nearsightedness early and managing its progression during the years when eyes are still growing can make a meaningful difference in where a child’s prescription ends up as an adult.