Brien Holden Myopia Impact Calculator
Estimate how myopia prevalence could change over time, and model the potential impact of an intervention program.
Educational model only. This tool is not an official Brien Holden Vision Institute calculator and should not replace clinical or policy analysis.
What is a “Brien Holden calculator”?
People often use the phrase “Brien Holden calculator” when they are looking for a simple way to estimate the burden of myopia and the value of prevention or control strategies. The Brien Holden legacy is strongly associated with evidence-based eye health, myopia science, and practical public health impact. So this page provides a quick planning calculator inspired by that goal: turning research ideas into numbers people can act on.
In short, this calculator helps answer a practical question: If current trends continue, how many people may be affected by myopia—and what could be reduced with intervention?
How this calculator works
The model projects prevalence growth over a chosen time horizon and compares two scenarios:
- Without intervention: prevalence grows at your baseline annual growth rate.
- With intervention: annual growth is reduced by your selected effectiveness percentage.
It then estimates:
- Projected prevalence at the end of the period (with and without intervention)
- Number of myopia cases in both scenarios
- Cases potentially prevented at the end of the period
- Annual cost difference at the end of the projection period
- Cumulative cost avoided across all years
Input guide
Population size
The total group you are modeling (city, district, school network, country segment, etc.).
Current myopia prevalence (%)
Your best estimate of present myopia prevalence in that population.
Annual prevalence growth (%)
Expected yearly increase if current trends remain unchanged. This is entered as a relative annual growth rate.
Projection period (years)
How far into the future you want to model outcomes.
Intervention effectiveness (%)
Estimated percentage reduction in annual prevalence growth due to interventions such as myopia management programs, outdoor-time initiatives, screening, and earlier optical treatment.
Annual cost per myopic person
A planning figure that can include exams, corrective lenses, follow-up care, productivity effects, or local health-system costs.
How to interpret your result
If the calculator shows a large gap between “without intervention” and “with intervention,” that indicates meaningful potential impact from program implementation. For planning teams, this can support:
- Funding proposals for school screening and early intervention
- Comparisons between prevention strategies
- Policy communication with health ministries and community stakeholders
- Resource forecasting for clinics and optometry networks
Important limitations
Every calculator simplifies reality. This one does not model age distribution, migration, dropout from care, adherence variability, or differences between low, moderate, and high myopia progression. It is best used as a directional planning tool—not as a definitive forecast.
For clinical decisions, use comprehensive eye exams and evidence-based protocols. For policy decisions, combine this estimate with local epidemiology, implementation constraints, and sensitivity analysis.
Bottom line
A “Brien Holden calculator” is most useful when it turns concern into action. Use this tool to frame the size of the challenge, model realistic intervention benefits, and make better-informed decisions around myopia control at scale.