Description
Convert a supplied corneal radius between metres and millimetres.
Eye records preserve laterality, reference axes, chart distance, calibration provenance and geometric scale. Disc-diameter units are a relative image scale, not a physical length, and cylinder sign differs from a full prescription transformation. Supplied labels and conversions do not inspect an eye, detect disease or choose care.
Convert a supplied corneal radius between metres and millimetres.
When to use this tool
Use Cornea Radius Unit Crosswalk when you already have radius, sourceUnit and need to convert a supplied corneal radius between metres and millimetres.
How to use the tool and how it works
- Enter radius, sourceUnit. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read millimeters, meters. Use the output convention below.
Require radius>0 and sourceUnit mm or m; use 1000 mm=1 m.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| radius | Radius | Required. Finite number; strictly above 0. |
| sourceUnit | Source Unit | Required. Text; one of "mm", "m"; maximum UTF-16 length 8192. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| millimeters | Millimeters | Required. Finite number. |
| meters | Meters | Required. Finite number. |
{
"input": {
"radius": 7.8,
"sourceUnit": "mm"
},
"output": {
"millimeters": 7.8,
"meters": 0.0078
}
}Limitations and assumptions
- The tool does not measure the cornea, estimate optical power or select a clinical radius or treatment.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Review the original image calibration, refraction convention and chart-distance record for substantive measurements. Use complete optical or image geometry when physical scale or clinical interpretation is required; relative disc units and axis labels preserve narrower conventions.
References
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