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Visual Acuity Ratio Scenario Calculator — result sheet
Convert a supplied Snellen-style numerator and denominator into a decimal acuity ratio and logMAR value.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Decimal ratio=numerator/denominator; logMAR=log10(denominator/numerator).
This is a unitless arithmetic conversion of supplied acuity notation, not an eye examination or clinical interpretation.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Test distance numerator — minimum 1.0E-6; maximum 1000
- Smallest readable line denominator — minimum 1.0E-6; maximum 1000
Worked example
| Input | Value |
|---|---|
| Test distance numerator | 20 |
| Smallest readable line denominator | 20 |
Decimal ratio =1; logMAR =0.
Assumptions and limits
- Both entries use the same distance convention and are positive numbers.
- The notation is treated as a ratio only; chart design, letter size, contrast, refraction, and testing conditions are not modeled.
- The result does not diagnose vision or replace an eye-care assessment.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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