The accelerating global prevalence of myopia has turned this refractive condition into a major public health issue. Increasing clinical evidence indicates that not only high myopia, but also moderate forms—when not properly managed—are associated with an elevated risk of ocular complications.
The study published by Bullimore and Brennan (2019) in Optometry and Vision Science provides a comprehensive population-based analysis explaining why every diopter gained or lost truly matters.

The importance of slowing myopia progression

The authors analyzed data from five major population-based studies, encompassing more than 21,000 patients.
Results demonstrated that each 1-diopter increase in myopia is associated with a 67% higher prevalence of myopic maculopathy—the most severe and frequent sight-threatening complication of myopia.
In other words, slowing myopia progression by just 1 diopter can reduce the risk of developing this condition by approximately 40%, regardless of the patient’s baseline refractive error.

This relationship is not linear: each additional diopter multiplies the risk exponentially, making the preventive impact of myopia control therapies evident even in mild cases.

Clinical implications for optometric practice

Bullimore and Brennan emphasize that any reduction in myopia progression has measurable clinical value, even if the dioptric change seems modest.
In practice, this means that a child who, due to an optical intervention (myopia management lenses, orthokeratology, or low-dose atropine), stabilizes at –3.00 D instead of –4.00 D, benefits from a 40% lower lifetime risk of developing myopic maculopathy.

Cumulative benefits of early management

The effectiveness of myopia management interventions should not be assessed only in terms of visual acuity, but also in terms of the cumulative long-term ocular health benefit.
By limiting axial elongation, we proportionally reduce the risk of structural complications such as:

• Myopic macular degeneration
• Retinal detachment
• Myopic glaucoma
• Chorioretinal atrophy

Therefore, every small therapeutic improvement translates into a measurable and meaningful long-term ocular health benefit.

Public health perspective

The study suggests that a 40% reduction in the prevalence of myopia-related complications worldwide would have an impact comparable to preventing other major chronic diseases.
Myopia control is no longer merely a refractive or aesthetic intervention—it represents a preventive ocular health strategy with significant implications for the visual well-being of younger populations.

Conclusions

Every diopter counts.
Continuous monitoring of progression, early initiation of treatment, and ensuring patient adherence are essential to reducing future ocular risks.
This study reinforces the principle that myopia management is a public health intervention, whose success should be measured not only in diopters, but also in years of preserved vision.

Primary Source: Bullimore, M. A. & Brennan, N. A.
Myopia Control: Why Each Diopter Matters.
Optometry and Vision Science, 96(6): 463–465, June 2019.