Lead
The school vision screening comes back "B" or "C." An eye exam confirms early myopia and a prescription is written. The questions that follow are predictable: Is it from too much screen time? Does wearing glasses make it worse? Is there anything we can do?
One thing contemporary ophthalmology can say with some confidence: myopia doesn't reverse — but its progression can be managed. Whether a parent holds that premise or not may substantially affect where their child's vision ends up over the next ten years.
The Basics — Why Myopia Progresses
The primary driver of myopia is axial elongation: excessive lengthening of the eyeball from front to back, causing light to focus in front of rather than on the retina: the eyeball grows longer front-to-back, pushing the focal point in front of the retina. The problem is that an elongated axis does not shrink. Once axial myopia has begun, it tends to progress through the school years and into adolescence if left unmanaged.
Myopia rates have risen globally. In urban Japan, prevalence among elementary school children has been reported at 37–64%, varying by age and region [1]. High myopia (−6 diopters or more) is associated with meaningfully increased risks of retinal detachment and glaucoma [1]. This is not simply a question of blurry distance vision.
"Two Hours Outside" — Where the Evidence Comes From, and Its Limits
The intervention with the strongest evidence for preventing myopia progression is not glasses, not screen time limits — it is increased time outdoors.
In a randomized controlled trial among 952 Chinese schoolchildren, adding 40 minutes of outdoor time per school day resulted in a significantly lower cumulative incidence of myopia after three years compared with controls (30.4% vs 39.5%) [2]. A meta-analysis estimated that increasing outdoor time by 76 minutes or more per day was associated with roughly a 50% reduction in myopia onset risk [3].
The effect appears to be attributable to bright outdoor light (10,000 lux or more) rather than to physical activity or reduced near-work time — these factors have been shown to operate independently [3]. The "two hours" figure derives from this meta-analysis and from national guidelines in several countries; it is a rough target rather than a precise threshold.
The practical framing that follows from this: finding reasons for a child to go outside is more actionable than restricting games or reading.
Low-Dose Atropine Eye Drops — Current Evidence
For slowing myopia that has already begun, the most closely watched pharmacological option is low-dose atropine (0.01%). A 2025 systematic review and meta-analysis of 11 trials involving 2,046 children found that 0.01% atropine reduced myopia progression by 0.16 diopters per year and axial elongation by 0.07 mm per year compared with placebo [4].
Higher concentrations (0.025–0.05%) produce larger effect sizes but cause more side effects — near-blur (accommodation impairment) and light sensitivity. The 0.01% concentration is generally better tolerated for long-term use, though the appropriate dose is an individual clinical decision [5].
Network meta-analysis comparing atropine with orthokeratology: a non-surgical technique using rigid contact lenses worn overnight to temporarily reshape the cornea and correct myopia (specially designed contact lenses worn overnight) finds the two to be roughly equivalent in effect on myopia control [6].
In Japan, low-dose atropine eyedrops are currently used off-label, without insurance coverage. Prescription requires adequate discussion with an ophthalmologist and ongoing follow-up.
The Glasses Myth — and the Value of a Vision Log
The belief that wearing glasses accelerates myopia has no evidence base. In fact, the evidence runs the other way: undercorrection — prescribing a weaker prescription than needed — has been shown in a randomized trial to promote rather than inhibit myopia progression: the gradual worsening of myopia, measured in diopters, over months or years [7]. Appropriate correction is the reasonable choice from the standpoint of not making things worse.
From a record-keeping standpoint, it's worth knowing that the school vision screening grades (A/B/C/D) and an ophthalmologist's refractive measurement (in diopters) are not the same thing. Screening is a filter; tracking progression requires formal refractive assessment — ideally once or twice a year. Keeping a log of "date, right eye, left eye, diopter value" makes the rate of progression visible and gives the ophthalmologist useful data for treatment decisions.
A parenting record app can be used to keep clinic dates and refraction values together, so appointments aren't missed and the first-visit intake is already halfway done.
What You Can Do Starting Now
There are not many high-leverage actions here, but three have low barriers:
- Build outdoor time deliberately. An after-school hour outside touches myopia prevention, sleep, bone density, and physical fitness simultaneously. "Give them a reason to go outside" is more sustainable than "make them stop gaming."
- Get a baseline refraction test before or around school entry. A school screening grade of "A" (roughly equivalent to 20/25 vision) can coexist with mild myopia of up to about −0.75 diopters. The school screening will miss early myopia; an ophthalmologist's refraction with axial length measurement is the right starting point for monitoring.
- Log the numbers once a year. "Date, right/left diopter value" at each eye exam. A few years of data side by side make progression speed legible and can prompt a conversation about whether intervention is warranted.
Summary
Myopia doesn't resolve on its own. That is precisely why the two-phase perspective matters: prevent onset before it starts (outdoor time), and manage progression once it has (regular refractive measurement, awareness of options like low-dose atropine). The record is the cheapest instrument available for making the second phase work — it converts appointments into a longitudinal view that can actually guide clinical decisions.
References
- Matsumura S, Hirai A, Matsui Y, et al. Current prevalence of myopia and association of myopia with environmental factors among schoolchildren in Japan. JAMA Ophthalmol. 2019;137(11):1233–1239. doi:10.1001/jamaophthalmol.2019.3103. PMID: 31415060.
- He M, Xiang F, Zeng Y, et al. Effect of time spent outdoors at school on the development of myopia among children in China: a randomized clinical trial. JAMA. 2015;314(11):1142–1148. doi:10.1001/jama.2015.10803. PMID: 26372583.
- Xiong S, Sankaridurg P, Naduvilath T, et al. Time spent in outdoor activities in relation to myopia prevention and control: a meta-analysis and systematic review. Acta Ophthalmol. 2017;95(6):551–566. doi:10.1111/aos.13403. PMID: 28251836.
- Xie D, et al. A systematic review with meta-analysis on the efficacy of 0.01% atropine eyedrops in preventing myopia progression in worldwide children's populations. Acta Ophthalmol. 2025. doi:10.1111/aos.17523. PMID: 40474980.
- Wei S, et al. Efficacy and adverse effects of atropine for myopia control in children: a meta-analysis of randomised controlled trials. Br J Ophthalmol. 2022;106(8):1171–1178. doi:10.1136/bjophthalmol-2020-318256. PMID: 36993096.
- Walline JJ, Lindsley KB, Vedula SS, et al. Efficacy of atropine, orthokeratology, and combined atropine with orthokeratology for childhood myopia: a systematic review and network meta-analysis. Ophthalmology. 2022;129(9):988–998. doi:10.1016/j.ophtha.2022.03.014. PMID: 35688780.
- Chung K, Mohidin N, O'Leary DJ. Undercorrection of myopia enhances rather than inhibits myopia progression. Vision Res. 2002;42(22):2555–2559. doi:10.1016/s0042-6989(02)00258-4. PMID: 12445849.