Back to Medical Tools
Visual Acuity Converter
Convert between Snellen fractions and LogMAR values for clinical ophthalmic assessment and research.
20/200 — U.S. statutory visual-acuity threshold for legal blindness when measured in the better eye with best correction. Certain severe visual-field restrictions may also qualify.
Format: numerator/denominator (e.g., 20/40)
Reference Chart
| Snellen | LogMAR | Description |
|---|---|---|
| 20/20 | 0.0 | Normal vision |
| 20/30 | 0.18 | Slight reduction |
| 20/40 | 0.30 | Moderate reduction |
| 20/60 | 0.48 | Significant reduction |
| 20/100 | 0.70 | Severe visual impairment |
| 20/200 | 1.0 | Legally blind |