In routine optometry clinics, anxious parents frequently ask: "Doctor, my child's myopia increased by 100 diopters this year. Is that normal? Do we need immediate intervention?"

Today, we'll comprehensively address parents' top concern on myopia prevention by aligning with national guidelines. This includes the science behind myopia progression, key risk factors, evidence-based intervention strategies, and common misconceptions to help you avoid pitfalls in your child's eye care journey.

Is a 100 diopter increase in myopia per year within the normal range?

Based on the authoritative standards for myopia prevention and control in children and adolescents issued by the National Health Commission of China:

For children in the growth phase, an annual myopia increase of 50–75 diopters is considered a stable range. An annual increase exceeding 50 diopters indicates progressive myopia. A yearly progression of 100 diopters signals abnormally rapid deterioration and requires timely intervention to manage...

Generally, no—but two specific exceptions allow for temporary flexibility:

For children newly diagnosed with low myopia, small fluctuations in prescription during the eye's adaptation phase are normal. A short-term increase is common, but if the prescription exceeds 100 degrees for two consecutive years, it requires attention.

In preschool-aged children, eye growth is rapid, with an initial rate slightly higher than in older children. However, even so, it is not recommended to sustain an annual increase of 100 diopters over the long term.

For the vast majority of children whose myopia increases by 100 degrees in a year, the root cause is chronic overuse from prolonged near work combined with insufficient outdoor activity. If left unchecked, this trend can quickly lead to high myopia and elevate the risk of retinal complications later on.

II. How Does Myopia Sneak Up on You?

Many parents focus solely on the prescription number without understanding the core causes of myopia:

Our eyes function like precision cameras. In a healthy state, incoming light is accurately focused onto the retina, ensuring clear vision.

Children and adolescents are in a growth phase where the axial length of the eye gradually elongates alongside physical development. If this elongation exceeds a normal rate, light focuses in front of the retina, causing distant objects to appear blurry. This leads to the formation of true myopia. Source: State Council of China.

Axial length growth is irreversible and only stabilizes after height growth ceases. During development, the faster the axial length increases, the more rapidly myopia progresses. This is a key reason for the sharp rise in nearsightedness among children during elementary and middle school years.

3. Five Key Factors Driving Your Child's Myopia Progression

1. Innate genetic foundation

If both parents are highly myopic, the child's risk of developing myopia increases significantly. Genetics predisposes the child to myopia, while poor environmental factors in daily life accelerate its onset and progression.

2. Reading/writing distance too close; incorrect posture

Many children hold their heads too close to their desks while doing homework. This forces their eyes to remain in a state of constant, near-focus strain, leading to cumulative eye fatigue that directly stimulates excessive elongation of the eyeball.

Standard Reading and Writing Posture: Remember the "One Fist, One Foot, One Inch" Rule

Keep your chest about a fist's width away from the table edge, your eyes about one foot (approximately 33cm) from the book, and hold the pen with your fingertips about one inch from the tip. Dim lighting, reading while lying down, or reading in a moving vehicle all increase eye strain. Xinhua News Agency.

3. Severe lack of daytime outdoor activities

Academic pressure consumes most outdoor time, making it the leading cause of today's high myopia rates.

Outdoor natural light stimulates dopamine secretion in the retina, effectively inhibiting excessive elongation of the eyeball. It is widely recognized as the most cost-effective prevention method. Authoritative guidelines recommend at least 2 hours of outdoor activity during daylight each day; it remains effective even on cloudy days. During breaks, step outside to gaze into the distance and relax your eyes. Guangxi Zhuang Autonomous...

4. Unrestricted use of electronic devices

Phones, tablets, and TVs are part of daily life, but staring at screens for long periods drastically reduces blinking frequency, leading to dry, sore eyes and sustained strain.

For non-educational use, limit screen time to no more than 15 minutes at a session and 1 hours per day. Even during online classes, take regular breaks to avoid eye strain.

5. Binocular vision dysfunction

Strabismus, latent strabismus, and weak binocular fusion can cause children to experience double vision, line skipping, eye strain, and fatigue. This forces the visual system into a compensatory state, indirectly accelerating myopia progression. These issues often require professional optometric examination for detection.

IV. Myopia progressing too fast? 4 science-backed intervention steps

True myopia is irreversible. The core goal is to slow the progression of refractive error and control axial elongation, preventing the development of high myopia. Effective management consists of four key components:

1. Precise, professional optometry to establish a solid foundation for prevention and control.

Never treat a child's eye exam casually. Accurate data is essential for prescribing glasses and developing a vision control plan.

Jingmu Eyewear adopts the Zeiss 11-step standardized digital dispensing system, covering a complete workflow of objective refraction testing, KEELER professional retinoscopy, and ZEISS VISUPHOR 500 precision comprehensive refraction. All optometrists hold national senior optometry qualifications with extensive experience, capable of comprehensively assessing multiple ocular parameters including prescription power, axial length, corneal curvature, and binocular vision function for rigorous and reliable results.

2. Choose myopia control lenses on demand for personalized eyewear.

Current myopia control methods each suit different groups. Choose based on your child's eye conditions.

Defocus spectacle lenses: Widely applicable; use specialized optical design to create peripheral myopic defocus, slowing axial elongation. Suitable for most school-aged children with myopia.

Orthokeratology (Ortho-K) lenses: Worn overnight to provide clear vision during the day without glasses. Highly effective for myopia control, but requires strict adherence to eye health criteria, meticulous hygiene, and regular follow-ups as directed by your doctor.

Standard single-vision lenses provide clear vision but offer minimal myopia control. Jingmu eyewear creates a personalized vision management plan for children by integrating prescription data, daily visual demands, and age-specific factors.

3. Long-term management of daily visual habits

Prevention and control rely on daily persistence. Make sure to follow these simple guidelines:

Follow the 20-20-20 rule: Every 20 minutes of close-up viewing, look at a distant object at least 6 meters away for no less than 20 seconds; reading or doing homework continuously should not exceed 40 minutes, with a break of 10 minutes.

Maintain the "one fist, one palm, one inch" sitting posture and ensure the desk is well-lit with soft, comfortable lighting.

Reduce time spent on mindless video scrolling and gaming; replace fragmented moments with outdoor walks or exercise.

4. Regularly review progress and adjust the plan dynamically

Myopia management is a long-term, dynamic process—not a one-time fix after getting glasses.

Schedule vision, refraction, and axial length checkups every 3–6 months. Monitor data trends; if changes accelerate, adjust your myopia control strategy promptly.

Whale Vision creates a personalized myopia development profile for each child, capturing every exam data point. Parents can easily track vision changes over time, while professionals use this data to continuously optimize management plans.

5. The 3 Most Common Fatal Mistakes Parents Make

Misconception 1: Ignore blurry vision in the early stages; it will get better on its own.

Many parents mistakenly believe that occasional squinting or blurred vision is just due to lack of rest, delaying eye exams. By the time myopia progresses to 200–300 degrees and they seek help, they've already missed the optimal early intervention window, making it difficult to control further progression.

Myth 2: Expensive lenses aren't a cure-all; daily eye habits still matter.

Even the best myopia-control glasses are only an aid. If you continue to sit for long periods at close range, overuse electronic devices, and avoid outdoor activity, their effectiveness will be significantly reduced. Developing healthy vision habits is the core of myopia prevention and control.

Misconception 3: Buying glasses online casually just to save money and effort

Buying glasses online means you can't get professional refraction or binocular vision testing. Errors in prescription, pupillary distance, and astigmatism axis are common. Ill-fitting glasses worsen eye strain and can accelerate myopia progression—making the trade-off not worth it.

Summary

A child's myopia increased by 100 degrees in a year, indicating a relatively fast progression that requires immediate parental attention.

Myopia control for children is never just about a pair of glasses. It requires a comprehensive system: precise prescription and fitting at professional facilities, sufficient daily outdoor activity, proper eye-use habits, and regular monitoring of axial length and refractive error—all are essential.

In our daily consultations, we often see parents focusing solely on lens brands while overlooking critical factors like visual habits, binocular vision function, and long-term management. We encourage all parents to adopt a balanced mindset and manage children's vision scientifically to ensure their long-term clear sight.