What Is Myopia?

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Myopia, commonly called nearsightedness, is a refractive error that makes distant objects appear blurry while close-up vision stays clear. According to the American Academy of Ophthalmology, nearly half the world’s population could be myopic by 2050. The condition is especially common in children. Below, we cover what causes myopia, its risk factors, prevention strategies, and when to seek specialist care.

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Key Takeaways

Myopia occurs when the eyeball grows too long, causing light to focus in front of the retina instead of on it.

Genetics and lifestyle both play a role; children with myopic parents who also spend excessive time on near work face the highest myopia risk.

Severe myopia (greater than 6 diopters) significantly increases the chance of serious eye conditions like retinal detachment and glaucoma.

Proven myopia management strategies exist for children, including orthokeratology, atropine drops, and increased outdoor time.

Sudden vision changes warrant an urgent eye exam, as they may signal underlying health issues beyond simple progression.

What Causes Myopia?

Myopia develops when the eyeball elongates more than normal, or when the cornea curves too steeply. In either case, light entering the eye focuses in front of the retina rather than directly on it, making distant objects look blurry. The National Eye Institute describes this as one of the most common refractive errors worldwide.

Genetics are a major factor. A child with one myopic parent has roughly double the risk of developing nearsightedness; with two myopic parents, the risk climbs even higher. But genes alone don’t tell the whole story.

Environmental factors have accelerated myopia rates dramatically over recent decades. Prolonged close-up work (reading, homework, and device use) keeps the eyes locked in a near-focus state for extended periods. The relationship between screen time and myopia has drawn significant research attention, with the Mayo Clinic noting that extended near work is a recognized risk factor. Meanwhile, lack of outdoor time appears to be equally important. Natural daylight exposure may help regulate healthy eye growth in children, and studies consistently link more time outdoors with lower rates of pediatric myopia.

Why Is My Myopia Getting Worse?

For many children and teenagers, myopia is progressive. The eyes continue growing through adolescence, and prescriptions often increase annually until the mid-to-late twenties, when the eyeball typically stabilizes in length.

Several factors can accelerate this progression. Heavy near work without breaks, minimal outdoor activity, and a strong family history of nearsightedness all contribute. Children who develop myopia at a younger age tend to progress more rapidly, which is why early intervention through myopia management is so critical.

Not all worsening is gradual. Sudden myopia, where vision deteriorates noticeably over days or weeks, can indicate something beyond normal progression. Uncontrolled blood sugar (as in diabetes) can temporarily change the shape of the lens, causing rapid prescription shifts. Early cataracts may also alter how light refracts through the eye. If you or your child experience a sudden change in vision, schedule an urgent comprehensive eye exam to rule out these conditions.

Understanding Severe Myopia and Its Risks

Eye care professionals classify high myopia as a prescription greater than -6.00 diopters. At this level, the eyeball has elongated significantly, stretching the retina and other internal structures thinner than normal. This stretching creates long-term vulnerabilities that go well beyond needing thick glasses.

People with severe myopia face a substantially elevated risk of:

Retinal detachment, where the thinned retina pulls away from the back of the eye

Glaucoma, caused by increased pressure damaging the optic nerve

Cataracts, which tend to develop earlier in highly myopic eyes

Myopic maculopathy, a degenerative condition affecting central vision

These risks are why slowing myopia progression in childhood matters so much. Every diopter of progression avoided may meaningfully reduce the likelihood of these sight-threatening complications later in life.

Myopia Prevention and Management for Children

While no approach can guarantee myopia won’t develop, several evidence-based strategies may help slow its progression in children.

Outdoor time is one of the simplest and most effective tools. Research suggests that two or more hours of daily outdoor activity can reduce myopia risk in children. Encouraging recess, outdoor sports, and family walks adds up quickly.

Limiting recreational screen time and following the 20-20-20 rule (every 20 minutes, look at something 20 feet away for 20 seconds) helps reduce sustained near-focus strain.

For children already diagnosed with myopia, clinical options for pediatric myopia management include:

Orthokeratology (ortho-k): Specially designed rigid contact lenses worn overnight that gently reshape the cornea, providing clear vision during the day without glasses. Ortho-k has also shown promise in slowing eye elongation.

Low-dose atropine drops: Prescription eye drops administered at bedtime that may help slow myopia progression with minimal side effects.

Specialty contact lenses: Multifocal or peripheral defocus lenses designed specifically to slow the rate of prescription increase in growing eyes.

Your child’s eye doctor can recommend the best combination based on their age, prescription, and lifestyle.

When to See a Myopia Specialist

Consider scheduling an appointment with a myopia specialist if your child’s prescription is increasing by half a diopter or more each year, if they were diagnosed with myopia before age 10, or if there is a strong family history of high myopia. Adults should seek care for any sudden vision changes or if their prescription continues shifting after their mid-twenties.

At West Broward Eyecare, Dr. Brianna Rhue and Dr. Isabel Carvajal bring over 35 years of combined experience to families throughout Tamarac, Coral Springs, Parkland, Miramar, Weston, and Boca Raton. Our practice specializes in myopia management, orthokeratology, and specialty contact lenses, giving your family access to the latest evidence-based treatments under one roof.

Individual results may vary. Please schedule a comprehensive eye exam for personalized recommendations.

Whether you need a routine eye exam, myopia management, or specialty contact lenses for your child, we are here to help.

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FAQs

Can myopia be cured?

There is currently no cure for myopia. Glasses, contact lenses, and refractive surgery like LASIK correct the symptom (blurry distance vision) but do not reverse the underlying elongation of the eyeball. However, myopia management strategies may help slow progression in children, potentially reducing their final prescription and long-term complication risk.
At what age does myopia stop getting worse?

Most people see their prescription stabilize in their mid-to-late twenties, once the eye finishes growing. However, some adults experience continued small changes into their thirties or forties, particularly those with high myopia. Hormonal changes during pregnancy can also cause temporary shifts.
Does screen time cause myopia?

Research has not established screen time as a direct cause of myopia, but it is strongly associated with increased risk. The issue is likely sustained near focus rather than the screen itself. Children who spend long hours on devices and limited time outdoors face the highest risk, suggesting that balancing near work with outdoor activity is the most practical approach.