Monitor Viewing Distance Arm-Length Rule Checker
Measured viewing/arm ratio against caller comfort policy, not optical accommodation or monitor placement prescription. Caller independently establishes matching units, evidence, method edition and applicability; output is not compliance, diagnosis, work-safety approval, geological identity or validated hazard prediction.
Description
Monitor distance can be normalized by a measured arm length.
Monitor distance can be normalized by a measured arm length.1
Comparing that ratio with chosen bounds is a conditional geometric screen rather than a universal viewing-distance prescription. Use this tool to calculate monitor Viewing Distance Arm-Length Rule Checker from the supplied measurements and assumptions.
When to use Monitor Viewing Distance Arm-Length Rule Checker
Use this tool to calculate monitor Viewing Distance Arm-Length Rule Checker from the supplied measurements and assumptions. Establish the observation protocol, units, task and reference population or review criterion before entering measurements.
How to use Monitor Viewing Distance Arm-Length Rule Checker and understand its results
- Establish the observation protocol, units, task and reference population or review criterion before entering measurements.
- Enter observedEyeScreenDistanceCm, observedArmLengthCm, callerRatioLower, callerRatioUpper, using the field meanings and rules below, then run the tool.
- Read distanceArmRatio, signedRatioMargin. Interpret the fields using their units, signs and evidence conventions below.
- If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedEyeScreenDistanceCm | Observed eye screen distance cm | number | Required |
| observedArmLengthCm | Observed arm length cm | number | Required |
| callerRatioLower | Caller ratio lower | number | Required |
| callerRatioUpper | Caller ratio upper | number | Required |
Enter positive viewing distance and arm length plus nonnegative ordered ratio bounds. Compute distance/armLength and the smaller distance to either bound. A negative signed margin means the ratio lies outside the supplied inclusive interval; no fixed arm-length rule or clinical judgment is installed.
ratio=distance/armLength; margin=min(ratio−lower,upper−ratio) Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| distanceArmRatio | Distance Arm Ratio; follow the units, sign, ordering and evidence convention stated above | number |
| signedRatioMargin | Signed Ratio Margin; follow the units, sign, ordering and evidence convention stated above | number |
{
"input": {
"observedEyeScreenDistanceCm": 60,
"observedArmLengthCm": 50,
"callerRatioLower": 0.8,
"callerRatioUpper": 1.4
},
"output": {
"distanceArmRatio": 1.2,
"signedRatioMargin": 0.19999999999999996
}
}Limitations and assumptions
Comparing that ratio with chosen bounds is a conditional geometric screen rather than a universal viewing-distance prescription. Interpretation depends on the units, sampling scope and exact model described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.
Alternative or Complementary methods
Use Handle Length Palm Width Minimum Rule Checker for this related task: A handle must accommodate palm width and any chosen end clearances.
Use Anthropometric Counter Depth Forward Reach Kitchen Checker when its separate inputs and assumptions fit the question: Counter reach depends on functional reach, counter depth and front setback.
References
Similar or alternative tools
- Handle Length Palm Width Minimum Rule Checker
A handle must accommodate palm width and any chosen end clearances.
- Anthropometric Counter Depth Forward Reach Kitchen Checker
Counter reach depends on functional reach, counter depth and front setback.