Visual Acuity Converter
Convert visual acuity measurements between Snellen, LogMAR, Decimal, and Metric formats.
Input Parameters
Enter details for calculation.
Decimal Acuity
Expert Tip
Legal blindness in the United States is defined as visual acuity of 20/200 or worse in the better eye with correction.
Calculation Methodology & Details
Formula
Calculates resolving power ratios relative to normal vision benchmarks.
Important Disclaimer
The calculations provided are for educational and general informational purposes only. They do not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.
How Visual Acuity is Converted
Follow these steps to use this calculator:
Input Snellen Denominator
Enter standard 20/XX denominator value.
Read Conversions
View Decimal and LogMAR equivalent acuity scores.
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ℹ️ About this Calculation
This ophthalmology and otolaryngology (ENT) clinical calculator evaluates visual acuity metrics, intraocular lens power, audiometric hearing threshold shifts, voice dysfunction scores, and occupational noise exposure limits based on AAO and OSHA standards.
Variable Glossary
Sensory & Biometric Measurements
Snellen fraction (20/20), LogMAR, corneal keratometry (K), axial length (mm), audiogram decibels (dB), or dBA noise levels.
Clinical Assessment Scales
Target IOL diopters (SRK/T formula), pure-tone average (PTA), GRBAS dysphonia grade, and daily noise dose percentage.
How to Calculate Step-by-Step
Step 1
Select visual acuity notation system (Imperial Snellen, Metric, LogMAR, Decimal) or audiometric frequency thresholds.
Step 2
Input ocular biometry parameters, sound decibel levels, or voice acoustic ratings.
Step 3
Review converted vision scales, recommended lens implant diopters, or hearing impairment classification.