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Calcimator

Myopia Progression Calculator

Predict myopia progression over time based on current prescription, age of onset, and annual progression rate. Estimates adult stabilization.

About this calculator

Myopia (nearsightedness) tends to worsen fastest in younger children and slow as they approach adulthood -- longitudinal studies commonly report progression around -0.5 to -1.0 diopters per year in children diagnosed around age 6-7, tapering toward roughly -0.1 to -0.3 D/year by the mid-to-late teens. This calculator projects that decline forward using a single Annual Progression Rate you supply rather than modeling the taper itself, so it multiplies your entered rate by the years remaining until an assumed stabilization age of about 20. That's a simplification worth naming directly: published cohort data shows myopia often stabilizes earlier than 20 for many patients -- roughly half by age 15 and three-quarters by 18 in one widely cited dataset -- with a substantial minority continuing to progress into the early 20s, so age 20 functions here as a conservative outer bound for planning purposes rather than a universal biological cutoff.

Age of onset factors into the calculator's Total Lifetime Progression estimate specifically: earlier-onset myopia generally accumulates more total dioptric change by adulthood than myopia that first appears in the early teens, simply because it has more years to progress before stabilization, independent of the annual rate itself. None of these projections replace an actual optometric exam -- they are planning estimates for discussing myopia control options with an eye care provider, not a diagnosis.

Inputs

years
D
years
D/year

Results

5-Year Prediction

-4.5 D

10-Year Prediction

-7 D

Adult Prediction (~age 20)

-7 D

Total Lifetime Progression-6 D
Years Until Stabilization10 years
How to Use This Calculator
  1. Enter the patient's Current Age in years.
  2. Enter the Current Prescription as a negative diopter value (e.g., −2.00 D for −2.00 sphere).
  3. Enter the Age of Onset — the age when myopia was first diagnosed (earlier onset usually means more total progression).
  4. Enter the Annual Progression Rate in diopters per year — typically −0.25 to −0.75 D/year for children.
  5. Review the 5-Year and 10-Year Predictions and Adult Prediction (at approximately age 20) to guide myopia management decisions.

How the result changes with Annual Progression Rate

Annual Progression Rate5-Year Prediction10-Year PredictionAdult Prediction (~age 20)
-1.25-8.25 D-14.5 D-14.5 D
-0.75-5.75 D-9.5 D-9.5 D
-0.38-3.87 D-5.75 D-5.75 D
-0.25-3.25 D-4.5 D-4.5 D

What each input means

Current Age
Patient's current age in years.
Current Prescription
Current sphere power in diopters (enter as negative number for myopia).
Age of Onset
Age when myopia was first diagnosed. Earlier onset often means more progression.
Annual Progression Rate
Expected annual myopia progression in diopters per year (typically -0.25 to -0.75 D/year for children).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Current Age = 10, Current Prescription = -2, Age of Onset = 8, Annual Progression Rate = -0.5 = 4 input(s) provided
  2. Calculate 5-Year Prediction
    5-Year Prediction
    -4.5 = -4.5
  3. Calculate 10-Year Prediction
    10-Year Prediction
    -7 = -7
  4. Calculate Adult Prediction
    Adult Prediction
    -7 = -7
  5. Calculate Total Lifetime Progression
    Total Lifetime Progression
    -6 = -6
  6. Calculate Years Until Stabilization
    Years Until Stabilization
    10 = 10

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.

Frequently Asked Questions

Does myopia really stop progressing at exactly age 20?

Not precisely -- age 20 is this calculator's simplifying assumption, not a biological cutoff. Published research shows myopia stabilizes earlier than that for many patients (around half by age 15 and three-quarters by 18 in one widely cited study), while a meaningful minority continue progressing into their early 20s, so treat the age-20 assumption as a conservative planning bound rather than a guarantee.

Why does age of onset matter if I already know my current prescription?

Age of onset feeds this calculator's Total Lifetime Progression estimate, which projects from when myopia FIRST appeared through to stabilization -- separate from the 5-year and 10-year predictions, which project forward from today's prescription. Earlier-onset myopia has more years to accumulate progression before stabilizing, which is why two patients with the identical current prescription can have different total lifetime progression estimates if their onset ages differ.

Is a faster annual progression rate always worse for a younger child?

The annual rate itself carries the same weight regardless of current age in this calculator's math -- what changes with age is how MANY years remain until the assumed stabilization point, so a young child with more years ahead accumulates more total change from an identical annual rate than an older teen closer to stabilization already.

What's a typical annual progression rate for a child's myopia?

Published pediatric cohorts commonly report annual progression in the neighborhood of -0.25 to -0.75 diopters per year, though rates run faster in younger children (some studies report close to -1.0 D/year around ages 6-7) and slow substantially by the mid-to-late teens. Your eye care provider's own measured rate from your prescription history is more reliable than any single published average.

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