OK Lens vs Low-Dose Atropine: A Scientific Choice for Childhood Myopia Control

Introduction

According to data from the National Health Commission in 2023, the overall myopia rate among children and adolescents in China has reached 52.7%, with 35.6% among primary school students and a sharp rise to 71.1% among junior high school students. Faced with this serious trend, the most common question parents ask in ophthalmology clinics is: "OK lens or low-dose atropine, which should we choose?" Both options have been proven effective, but the decision is not as simple as picking one over the other. The choice should be based on an individualized assessment of the child's age, degree of myopia, corneal condition, visual habits, and family financial situation. This article, supported by evidence-based medical data, breaks down the pros, cons, and suitable scenarios of both approaches to help parents make rational decisions.

Two Mainstream Options: Mechanisms and Characteristics

1. Orthokeratology (OK Lens)

OK lenses are rigid gas-permeable contact lenses worn overnight that temporarily reduce myopia by mechanically reshaping the central cornea. Their core advantages include:

Significant efficacy: According to the International Myopia Institute (IMI) report, OK lenses can slow axial length growth by approximately 40%-60%, with average annual axial length growth controlled at 0.1-0.2 mm (compared to 0.3-0.4 mm per year in untreated children).

No glasses during the day: Children do not need to wear glasses during the day, making them especially suitable for those who are physically active or dislike wearing spectacles.

Reversibility: After discontinuation, the corneal shape gradually recovers, with no permanent damage.

However, OK lenses are not suitable for everyone and require the following conditions:

Age ≥8 years, with a certain level of self-care ability and hygiene habits (or parents who can strictly assist with care).

Myopia <600 diopters, astigmatism <150 diopters (some brands can correct astigmatism up to 300 diopters).

Corneal curvature between 39.0 and 46.0 D, without conditions such as keratoconus.

2. Low-Dose Atropine (0.01% Atropine Sulfate Eye Drops)

Atropine is an M-cholinergic receptor antagonist that inhibits excessive axial elongation by modulating ciliary muscle tone and the retinal dopamine system. The low concentration (0.01%) maintains efficacy while significantly reducing side effects such as photophobia and blurred near vision.

Efficacy data: The ATOM2 study (Singapore) confirmed that 0.01% atropine can slow myopia progression by approximately 50-60%, but individual responses vary greatly, with about 15% of children being "non-responders."

Convenient administration: One drop per night, no corneal contact, low infection risk, especially suitable for younger children (from age 6) or those who cannot tolerate OK lenses.

Long-term safety: No serious adverse reactions have been observed with continuous use for 2-3 years, but rebound in refractive error may occur after discontinuation, requiring gradual tapering.

How to Make a Scientific Choice: A Staged Decision-Making Framework

Step 1: Assess Baseline Conditions

Take the child to a reputable ophthalmic institution for a comprehensive examination, including cycloplegic refraction, axial length measurement, corneal topography, intraocular pressure, and fundus examination. Key indicators:

Age: For children <8 years with poor cooperation, atropine is preferred; for those ≥8 years with strong self-care ability, both options are viable.

Myopia progression rate: If annual progression is ≥0.5 D or annual axial length growth is >0.3 mm, more intensive intervention (combination therapy) is recommended.

Corneal conditions: Children with overly flat or steep corneas, trichiasis, or dry eye syndrome are not suitable for OK lenses.

Step 2: Consider Lifestyle and Expectations

If the child is enthusiastic about swimming, dancing, or outdoor sports, OK lenses can avoid the constraints of spectacles, but waterproof goggles should be worn while swimming.

If parents cannot guarantee nightly lens cleaning (e.g., due to frequent business trips), atropine is a more reliable choice.

If the child fears the sensation of a foreign body or has a history of conjunctivitis, the adaptation period for OK lenses (usually 1-2 weeks) may be challenging.

Step 3: Combination Therapy: A Powerful Synergy or Added Risks?

Clinical studies show that for those with rapid progression (annual increase >1.0 D) or poor compliance, combination therapy with OK lenses plus 0.01% atropine can further slow axial elongation by approximately 30%. For example, a 2-year observational study in Taiwan (2021) found that the combination group had an annual axial growth of only 0.09 mm, better than OK lenses alone (0.13 mm) or atropine alone (0.18 mm). However, combination therapy requires close monitoring of corneal endothelial cells, intraocular pressure, and tear film stability, and is more costly (in China, OK lenses cost approximately 8,000-12,000 RMB/year, while atropine costs about 2,000-3,000 RMB/year).

Big Data and Individual Variability: Don't Overlook the "Non-Response" Probability

Despite impressive average data, each child responds differently. Approximately 10-20% of OK lens wearers experience reduced efficacy due to lens decentration or poor corneal reshaping; about 15% of children are insensitive to low-dose atropine. Therefore, after selection, a 3-month observation period should be established:

Recheck refractive error and axial length every 3 months;

If annual axial growth still exceeds 0.2 mm, adjust the plan (e.g., increase outdoor activities, change lens design, or initiate combination therapy).

The International Myopia Institute (IMI) also recommends that ages 6-12 are the "golden window" for myopia management, during which intervention yields the best results.

Recommendations for International Patients

For families planning to come to China for myopia management, the following points are worth noting:

Undergo a comprehensive evaluation first: Do not directly purchase OK lenses or atropine; complete eye examinations under medical guidance. The Ophthalmology Center affiliated with Mei Jia Kang provides one-stop pediatric myopia management assessments, including corneal topography, axial length measurement, and personalized plan design.

Understand regulatory differences: In China, OK lenses are Class III medical devices and must be fitted at licensed medical institutions; 0.01% atropine is either a hospital-prepared formulation or an approved drug, requiring a prescription. Avoid purchasing through unofficial overseas channels to prevent inaccurate concentrations or contamination.

Consider long-term maintenance costs: OK lenses need to be replaced every 1.5-2 years, and care solution costs are significant; atropine must be used continuously for at least 2 years, with gradual tapering before discontinuation. Please check the detailed budget in the cost estimator.

Coordinate with local medical support: If you are from overseas, it is advisable to confirm follow-up coordination between Chinese doctors and your home country. Mei Jia Kang can assist in arranging remote follow-up consultations and medical record translation to ensure continuity of care after returning home.

Finally, no approach can replace behavioral interventions: at least 2 hours of outdoor activity daily, the 20-20-20 rule (every 20 minutes of near work, look at something 20 feet away for 20 seconds), and adequate sleep (≥10 hours for primary school students, ≥9 hours for junior high school students). Make a scientific choice, monitor consistently, and effectively control myopia progression.

(Data in this article are as of 2023; specific medication and lens fitting should follow medical advice.)