Why are so many more children needing glasses than ever before? The answer involves genetics, lifestyle, and screen time
Myopia — short-sightedness — has existed throughout human history. But the rate at which it's appearing in children today is unprecedented. This isn't a matter of better detection; it's a genuine increase in prevalence that researchers call the "myopia epidemic."
Three primary factors are driving this surge:
If one parent is myopic, a child's risk of developing myopia roughly doubles. If both parents are myopic, the risk triples. As the myopic population grows, more children are born with inherited susceptibility. Children with two myopic parents don't just have higher risk — they also tend to develop myopia earlier and progress faster.
Perhaps the single most important modifiable factor. Research consistently shows that children who spend more time outdoors have significantly lower rates of myopia. The mechanism appears to be related to light intensity: outdoor light (even on cloudy days) is typically 10-50x brighter than indoor light, which stimulates dopamine release in the retina that slows eye elongation. Urbanisation has dramatically reduced childhood outdoor time globally.
More time reading, studying, using screens, and doing close-up work is associated with faster myopia progression. Digital devices have compounded this effect dramatically. A child who reads on a tablet for 3 hours after school is doing far more near work than a child who reads a physical book for the same duration — and the total hours spent on devices has increased enormously since the 1990s.
Australian children have among the highest myopia rates in the world. A 2016 study found myopia prevalence among 12-year-olds in Sydney had reached 31%. Thirty years ago, it was below 10%. The trajectory is clear: without intervention, more Australian children will need glasses every year.
For a child who develops mild myopia (-1.00D to -3.00D), the main impact is needing glasses or contact lenses. Inconvenient, but manageable. For a child who progresses to high myopia (-5.00D or worse), the stakes are considerably higher.
High myopia is associated with significantly elevated lifetime risk of serious eye conditions:
• Retinal detachment: Risk increases ~20x compared to non-myopic individuals
• Myopic macular degeneration: Leading cause of irreversible vision loss in Asia
• Glaucoma: Risk increases ~2-3x
• Cataracts: Occur earlier and more frequently
• Posterior staphyloma: Structural eye complications
Research shows that the final adult myopia level is heavily influenced by when myopia first appears and how quickly it progresses in the early years. A child diagnosed at age 7 who progresses rapidly may reach -6.00D by age 15. The same child with early intervention might stabilise at -2.00D. The difference is lifelong.
The good news: myopia control works. Multiple evidence-based interventions can slow progression by 40-60% or more. The challenge is that many parents — and some optometrists — don't realise these options exist.
Ortho-K lenses: The most effective single method for many children. Worn overnight, they eliminate daytime glasses entirely while slowing eye growth.
Low-dose atropine drops: Simple daily eye drops with strong clinical evidence. Often used in combination with Ortho-K for enhanced effect.
Myopia control spectacles: MiYOSMART (from Hoya) and Essilor Stellest lenses offer 30-60% progression reduction without contact lenses. An excellent option for younger children.
• Aim for at least 2 hours of outdoor time daily
• Follow the 20-20-20 rule during near work (every 20 min, look 20ft away for 20 sec)
• Minimise recreational screen time for children under 12
• Ensure adequate lighting for reading and homework
• Have your child's eyes examined every 6 months if myopic
Early intervention is the single biggest factor in achieving good outcomes. If your child has been diagnosed with myopia, don't wait to see if it "settles down." Book a myopia control consultation now.
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