Two hours of this is the best prescription I can write.
"Doctor ji, she has started sitting right in front of the TV."
The mother says it. Then she looks at her daughter. Then back at me, half worry, half apology, as though the sitting-close were somehow her own fault.
And I already know the next question. It is always the next question.
"Is it the mobile?"
I have a soft spot for that question, because whoever asks it has already done the difficult part. They noticed. But my answer is rarely the one they came in expecting.
The most useful thing you can do for your child's eyes has very little to do with the phone. It has to do with opening the door and sending her outside.
Something changed, quietly
Think back to your own childhood. You went out after school and came home when the streetlights came on. Nobody scheduled it. Nobody called it "outdoor time."
Here is what none of us knew then: those afternoons were treatment.
A team at LV Prasad Eye Institute tracked city children in India. In 1999, about 4 in every 100 were short-sighted. By 2019, it was 21 in every 100 — roughly one extra child per hundred, every year, without pause. If that line holds, close to half of urban Indian children will need glasses by 2050 (Priscilla and Verkicharla, Ophthalmic & Physiological Optics, 2021).
Half the class. In one generation.
Let me be honest rather than dramatic. A newer review of Indian studies came out lower, around 8 in 100, with no clear year-on-year climb (Kumar and colleagues, Ophthalmic Epidemiology, 2025). Our data is uneven. But ask any of us in a city clinic and you hear the same sentence: we are writing far more prescriptions for far smaller children than we used to.
"So what, doctor? She'll just wear glasses."
Usually said by a father, usually kindly. And it is fair — glasses are not a tragedy.
But short sight is not a problem with the glass. It is the shape of the eyeball. The eye grows a little too long from front to back, like a soft ball being gently stretched.
And that stretching does not come back. Not ever. A stretched eye has thinner walls behind, which across a lifetime means a raised risk of the retina peeling away, of damage to the central seeing area, of glaucoma.
Which is why the age it starts matters far more than the number on the prescription. A child who becomes short-sighted at seven has years of growing still ahead, and the number climbs through every one of them. Our job is not to correct the number. It is to push the starting date as late as we possibly can.
The medicine is sunlight
Researchers in Shanghai put light-sensing smartwatches on nearly 3,000 children for a year. Total minutes outdoors mattered less than the pattern: only unbroken stretches of at least fifteen minutes, in genuinely bright light, made any difference (Chen and colleagues, JAMA Network Open, 2024).
Your best-lit drawing room is nothing compared with an ordinary Indian afternoon. You cannot get this dose indoors. Not beside a window. Outside, or not at all.
And here is the part I most want you to carry away. The same team found that in children who had already begun drifting towards short sight, outdoor time helped much less (Chen and colleagues, British Journal of Ophthalmology, 2026).
Sunlight is a prevention, not a cure. By the time she is squinting at the blackboard, the window has largely shut. Which is exactly why I am telling you now, while she is five, and not in five years.
If it has already started we are not helpless — but know what is being oversold. The Cochrane group pooled 104 trials and 17,509 children. Strong atropine drops slow things down convincingly. The very weak drops below 0.1%, which is what most Indian families are actually offered, showed only a small effect, rated very low certainty (Lawrenson and colleagues, Cochrane, 2025). An American trial of 0.01% atropine found it worked no better than drops with nothing in them (Repka and colleagues, JAMA Ophthalmology, 2023).
What I actually ask parents to do
Two hours outside, most days. Cycling, gully cricket, homework on the terrace at four o'clock. In long stretches, not scattered crumbs.
Get her eyes properly examined — a full dilated test, not a chart on a wall — before school begins, and every couple of years after. Children assume the whole world looks the way theirs does.
If glasses are prescribed, check after a month that they are on her face. Not in the bag.
And about the mobile. Close work probably contributes something, but the evidence for daylight is far stronger. If you are waging a daily war over screen time while she spends every hour of sunlight indoors, you are fighting the wrong war.
We spend enormous energy protecting our children from things we cannot control. The air. The traffic. The exam.
This one is in your hands. It is free, and it arrives every single afternoon.
Open the door. Let her come back dusty and thirsty and slightly too pleased with herself.
Sourced from studies indexed on PubMed, all linked above. General guidance only, and no substitute for examining your child.
