Eyewear OD–Visibility Score

Score supplied laser-eyewear optical-density adequacy while retaining visible-light transmission.

Description

Eyewear scoring compares supplied optical density with a required density and retains visible-light transmission as a visibility measure.

Eyewear scoring compares supplied optical density with a required density and retains visible-light transmission as a visibility measure. The combined score is a custom arithmetic heuristic.^[1]

Score supplied laser-eyewear optical-density adequacy while retaining visible-light transmission.

When to use Eyewear OD–Visibility Score

Use this tool to score supplied laser-eyewear optical-density adequacy while retaining visible-light transmission.

Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.

How to use Eyewear OD–Visibility Score and understand its results

Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
Enter eyewearOpticalDensity, requiredOpticalDensity, visibleLightTransmissionPercent using the field table and calculation rules, then run the tool.
Read opticalDensityMargin, hazardTransmissionFraction, protectionVisibilityScore, meetsRequiredDensity. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
eyewearOpticalDensity	Eyewear optical density	number; minimum: 0	Required
requiredOpticalDensity	Required optical density	number; minimum: 0	Required
visibleLightTransmissionPercent	Visible-light transmission (%)	number; minimum: 0; maximum: 100	Required

Enter nonnegative densities and VLT 0–100%. Return margin, hazard transmission, score and inclusive density gate.

margin=eyewearOD−requiredOD; hazardTransmission=10^(−OD); score=VLTpercent/(1+max(0,−margin))

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
opticalDensityMargin	Optical-density margin	number
hazardTransmissionFraction	Hazard transmission fraction	number; minimum: 0; maximum: 1
protectionVisibilityScore	Protection/visibility score	number; minimum: 0; maximum: 100
meetsRequiredDensity	Meets required density	boolean

json

{
  "input": {
    "eyewearOpticalDensity": 5,
    "requiredOpticalDensity": 4,
    "visibleLightTransmissionPercent": 50
  },
  "output": {
    "opticalDensityMargin": 1,
    "hazardTransmissionFraction": 0.00001,
    "protectionVisibilityScore": 50,
    "meetsRequiredDensity": true
  }
}

Limitations and assumptions

No wavelength/pulse certification, eyewear condition, fit or safety standard is evaluated. The score is not a standardized protection rating.

Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.

Alternative or Complementary methods

Use Required Optical Density: Calculate required optical density from unprotected and permissible exposure values in matching units. For a complementary task, use Laser Safety Audit: Compare required laser-safety controls with documented controls.

References

Eyewear OD–Visibility Score — tool.io

Similar or alternative tools

Required Optical Density
Calculate required optical density from unprotected and permissible exposure values in matching units.
Laser Safety Audit
Compare required laser-safety controls with documented controls.