Banner by Myana Lim

Seeing Myopia in a New Light 

by Avni Khandelwal

As the faint smell of sanitizer and the crinkling of exam table paper filled the room, I sat with my legs dangling above the tiled floor. Across the room, the eye chart glowed under bright lights. The tiny bottom row of letters left me no choice but to squint and guess as I read them aloud.  

My pediatric ophthalmologist typed loudly at his computer as I sat in silence. After a moment, he leaned over and mentioned that I was fine for now, but that I would likely need glasses in the next three years. 

I was thrilled. Glasses felt so grown up and mature. My mom, on the other hand, was terrified. No one in my family had needed glasses before, especially not at a mere four years old. How could he predict something three years in advance? And if he could see it coming, why was there nothing we could do to stop it? 

By 2050, nearly half of the world’s population is projected to be myopic, a 78.03% increase from the 2.64 billion individuals affected today. To understand the significance of this rise, it is important to first understand what myopia is. Myopia, known commonly as nearsightedness, results from excessive axial elongation of the eyeball during development. When the eye grows too long, incoming light rays converge before reaching the retina. The retina is the thin layer of light-sensitive tissue at the back of the eye that converts light into signals the brain can interpret as images. Because light converges in front of this layer rather than directly on it, the image that reaches the brain appears blurry.  

For decades, myopia has largely been attributed to genetics. Several studies on diverse populations estimate heritability rates of myopia to be as little as 50% to as high as 90%. However, emerging evidence has brought another factor into the spotlight: environmental influences. 

Over the past few decades, researchers have identified a key biological pathway linking bright outdoor light to eye growth regulation. When the retina is exposed to high-intensity light, such as natural sunlight, retinal amacrine cells release a hormone called dopamine. This neurotransmitter acts as a biochemical signal that slows axial elongation of the eye. In animal models, including studies in chicks and mice, increased light exposure raises retinal dopamine levels and reduces experimentally induced myopia. Essentially, dopamine functions almost like a “stop” signal, telling the growing eye that it does not need to elongate further. As a result, the light taken in by the eyes focuses directly on the retina instead of in front of it.  

Human epidemiologic studies align with these findings. Children who spend more time outdoors consistently show lower rates of myopia onset compared to peers who spend more time indoors. Importantly, this difference appears to be linked to sunlight exposure rather than physical activity or reduced screen time alone. Outdoor light can exceed 10,000 lux, while typical indoor lighting often remains below 500 lux. With lower light intensity, retinal cells produce less dopamine, which may increase the risk of myopia development. 

The magnitude of change over the past generation is drastic. In parts of East Asia, the prevalence of myopia among young adults now exceeds 80%. Such dramatic increases over a short time frame highlight the role of environmental pressures. Urbanization, intense academic demands, and prolonged indoor study periods have reshaped childhood experiences while youth screen time has increased rapidly and outdoor play has declined. 

This trend matters because myopia is more than just needing glasses. In fact, myopia can serve as a marker for worsening eye health overall. Individuals with significant axial elongation face increased risks of retinal detachment, myopic macular degeneration, and glaucoma later in life. The consequences of such issues range from minor blurry and double vision to complete blindness in extreme cases. As the prevalence of nearsightedness rises, so does the burden of vision-threatening complications. 

Looking back at my own childhood appointments, prevention was never part of the conversation. That absence reflects a broader gap between research and clinical practice. Today, many ophthalmologic and optometric organizations recommend that children spend at least two hours outdoors each day to reduce the risk of myopia. This recommendation is supported by longitudinal data showing that increased outdoor time lowers incidence rates . The intervention is simple, low cost, and low risk. 

Some countries have already translated this evidence into structured public health initiatives. In Taiwan, the “Tian-Tian 120” program encourages schools to provide at least 120 minutes of outdoor activity daily. After its implementation, surveillance data showed a reversal with a long-term upward trend of visual impairment among schoolchildren. Singapore has also implemented similar policies that integrate outdoor time into school routines and national childhood vision health campaigns. 

Despite these examples, awareness remains limited. In many pediatric settings, conversations still focus on screen limits and corrective lenses rather than proactive environmental strategies. Reducing excessive near work is important, but it does not replace the protective effects of bright light exposure.  

As future healthcare professionals, researchers, policymakers, we have an opportunity to rethink how we approach myopia. Vision health should be part of broader conversations about childhood development. Outdoor time supports not only ocular growth regulation but also physical activity, mental well-being, and social interaction. Encouraging children to spend time outside is a simple but powerful intervention. 

My pediatric ophthalmologist was not wrong in his prediction. Sure enough, three years later, I was given my first pair of hot pink glasses. They were definitely the coolest thing I could bring to show and tell after spring break that year. At the time, though, I did not realize how permanent myopia could be. From foggy lenses every time I wear a mask to swimming blindly and hoping I do not crash into the pool wall, poor vision shows up in small, everyday moments. Now, over a decade later, I am writing this article wearing a pair of glasses. I may have traded my hot pink frames for a simple clear pair, which is admittedly much more boring, but they serve as a daily reminder of my nearsightedness.  

 Luckily in today’s day and age, prediction does not have to mean inevitability. What if every well-child visit included a conversation about light exposure? What if school systems viewed outdoor recess as essential for visual development rather than optional? 

The next time a four-year-old sits on an exam table, swinging their legs, we should still celebrate their excitement about glasses if they want them. But we should also give families the knowledge to prevent the progression of myopia. Sunlight does more than brighten our days. It may help us see myopia through a different lens. 

So, the next time you see a closed door, open it and step outside. Soak up the sunshine. When it comes to protecting our vision, sometimes the clearest solution has been right in front of our eyes all along.