Myopia, commonly called nearsightedness, is a condition where you can see nearby objects clearly but distant ones appear blurry. It affects roughly 30% of the world’s population today, and that number is projected to reach 52% by 2050. The good news: multiple effective corrections exist, from glasses and contact lenses to surgical options that can eliminate the need for corrective eyewear entirely.
What Happens Inside a Myopic Eye
In a normally shaped eye, light entering through the cornea and lens converges precisely on the retina, the light-sensitive layer at the back of your eye. In a myopic eye, the eyeball is too long from front to back, so light focuses at a point in front of the retina instead of directly on it. By the time those light rays actually reach the retina, they’ve spread apart again, producing a blurry image of anything far away.
This elongation isn’t just a simple stretching of a sphere. The eye grows in a more tube-like pattern, with most of the lengthening happening toward the back. As the eye elongates, the retina thins out in certain regions, and the choroid and sclera (the layers behind and around the retina) thin as well, particularly at the back of the eye. This is why high degrees of myopia carry a greater risk of retinal problems later in life: the tissue at the back of the eye is physically thinner and under more strain.
Less commonly, myopia can also result from a cornea that curves too steeply or a lens inside the eye that’s too powerful. Both of these bend light too sharply, creating the same effect as an elongated eyeball: the focal point lands in front of the retina.
How Myopia Is Diagnosed
An eye care provider can diagnose myopia during a standard eye exam. The process typically starts with a visual acuity test, where you read letters on an eye chart at a set distance. If you struggle with smaller lines, that signals a refractive error. The provider then uses a lighted instrument called a retinoscope to observe how your retina reflects light, giving an objective measurement of how your eye bends incoming rays.
To fine-tune your prescription, they’ll use a phoropter, the device you look through while the examiner flips between different lenses and asks “which is clearer, one or two?” This process narrows down the exact lens power needed to shift your focal point back onto the retina. For young children who can’t read standard eye charts, providers use picture-based tests or a game where the child identifies which direction the letter E is pointing.
Glasses and Contact Lenses
The simplest correction for myopia is a concave (diverging) lens, the type used in standard glasses and contact lenses for nearsightedness. These lenses are thinner in the center and thicker at the edges, which spreads light rays slightly outward before they enter the eye. This counteracts the excessive bending that happens inside a myopic eye, pushing the focal point back so it lands on the retina instead of in front of it. Your prescription is written as a negative number (like -3.00 diopters), with a larger number indicating stronger correction for more severe myopia.
Contact lenses work on the same optical principle but sit directly on the cornea, which eliminates the frame-related distortion some people notice with glasses. Standard soft contacts, rigid gas-permeable lenses, and daily disposables are all available for myopia correction. The choice between glasses and contacts is largely personal preference, lifestyle, and comfort.
Surgical Options
For people who want to reduce or eliminate their dependence on glasses and contacts, several surgical procedures permanently reshape the cornea to correct how it focuses light.
LASIK
LASIK is the most widely known refractive surgery. During the procedure, a laser creates a thin flap in the outer cornea, which is folded back. A second laser then reshapes the underlying corneal tissue to correct the refractive error, and the flap is laid back into place. Recovery is fast. Most people can drive and return to work the next day.
PRK
PRK takes a different approach: instead of creating a flap, the surgeon removes the outer layer of the cornea entirely, then reshapes the tissue underneath with a laser. The outer layer regenerates on its own over about a week, but full visual clarity can take two to six weeks. PRK is often recommended for people with thinner corneas who aren’t ideal candidates for LASIK, since it doesn’t require enough corneal thickness to create a flap.
SMILE
SMILE is a newer, minimally invasive option. A single laser cuts a tiny disc-shaped piece of tissue (called a lenticule) inside the cornea, which the surgeon removes through a small incision. No flap is created and no outer layer is removed, which means less disruption to the corneal structure. Recovery takes one to two days, slightly longer than LASIK but significantly shorter than PRK.
All three procedures aim to flatten the central cornea just enough to shift the focal point back onto the retina. The best option depends on your prescription strength, corneal thickness, and lifestyle factors that your eye surgeon can evaluate.
Slowing Myopia in Children
Because myopia typically develops in childhood and worsens as the eye continues to grow, a growing area of eye care focuses on slowing that progression rather than just correcting the blur. This matters because higher degrees of myopia in adulthood increase the risk of serious eye conditions, including retinal detachment and macular degeneration.
Outdoor Time
One of the most straightforward interventions is simply spending more time outside. Research consistently shows that each additional hour children spend outdoors per week reduces their odds of developing myopia by 2% to 5%. The protective factor appears to be exposure to bright outdoor light rather than physical activity itself. Studies have tested a range of interventions, from an extra 40 minutes of outdoor recess on school days to 11 or more hours of outdoor time per week, and most show meaningful reductions in new myopia cases.
Low-Dose Atropine Eye Drops
Atropine eye drops, used at very low concentrations, can slow the progression of myopia in children. A full-strength dose effectively halts myopia progression but causes significant side effects like light sensitivity and difficulty focusing up close. Research has zeroed in on much lower concentrations that balance effectiveness with tolerability. Concentrations of 0.025% to 0.05%, applied nightly, slow eye elongation by roughly 29% to 51% compared to no treatment over one year. An even lower dose of 0.01%, once considered the standard, has shown minimal effect on eye growth in recent studies, prompting a shift toward the slightly higher concentrations.
Orthokeratology
Orthokeratology (Ortho-K) uses specially designed rigid contact lenses worn overnight. While you sleep, the lenses gently flatten the central cornea, providing clear vision during the day without glasses or contacts. Beyond the convenience factor, Ortho-K also steepens the peripheral cornea, creating a pattern of focus across the retina that appears to signal the eye to slow its elongation. Children remove the lenses each morning and go about their day with corrected vision.
Specialty Spectacle Lenses
A newer option for children who prefer glasses over contacts is DIMS (Defocus Incorporated Multiple Segments) lenses. These look like regular glasses but contain a central zone for clear distance vision surrounded by concentric rings of tiny lenslets that create a mild defocus signal across the retina. In clinical use, about 81% to 85% of children wearing DIMS lenses kept their annual myopia progression to half a diopter or less, and 61% showed a good response in terms of controlling eye elongation over 12 months.
Why Myopia Prevalence Is Rising
The rapid increase in myopia worldwide, from 27% of the global population in 2010 to a projected 52% by 2050, points strongly to environmental factors rather than genetics alone. Children today spend significantly more time on near-focused tasks like screens, tablets, and books, and less time outdoors than previous generations. Urbanization plays a role too: children in densely built cities with less access to open outdoor spaces consistently show higher myopia rates than those in rural areas. The combination of reduced outdoor light exposure and prolonged close-up visual work during the years when the eye is still growing creates conditions that push more eyes toward elongation and myopia.