Snellen (meters) to logMAR
Type a value in Snellen (m) to get it in logMAR instantly.
0.5229logMAR
That's 3× as sharp as the US legal blindness limit (20/200), while the usual driving minimum (20/40) is 1.67× sharper. What a normal eye reads at 20 ft (6 m), this eye reads from about 6 ft (1.8 m).
What it means
How sharp is that?
For information only: an eye test also depends on the chart, lighting and the examiner. Ask an optometrist about your own eyes.
The math
How to convert Snellen (m) to logMAR
Decimal = 20 ÷ x for 20/x, or 6 ÷ x for 6/x; logMAR = −log₁₀(decimal); ETDRS letters = 85 − 50 × logMAR.
Example: 6/20 Snellen (m) = 0.522879 logMAR.
Every unit
That eyesight in every notation
Tables
Snellen (m) to logMAR conversion table
| Snellen (m) | logMAR |
|---|---|
| 6/10 Snellen (m) | 0.221849 logMAR |
| 6/15 Snellen (m) | 0.39794 logMAR |
| 6/20 Snellen (m) | 0.522879 logMAR |
| 6/25 Snellen (m) | 0.619789 logMAR |
| 6/30 Snellen (m) | 0.69897 logMAR |
| 6/40 Snellen (m) | 0.823909 logMAR |
| 6/50 Snellen (m) | 0.920819 logMAR |
| 6/60 Snellen (m) | 1 logMAR |
| 6/70 Snellen (m) | 1.06695 logMAR |
| 6/80 Snellen (m) | 1.12494 logMAR |
| 6/100 Snellen (m) | 1.22185 logMAR |
| 6/200 Snellen (m) | 1.52288 logMAR |
| 6/400 Snellen (m) | 1.82391 logMAR |
logMAR to Snellen (m) conversion table
| logMAR | Snellen (m) |
|---|---|
| -0.301 logMAR | 6/3 Snellen (m) |
| -0.125 logMAR | 6/4.5 Snellen (m) |
| 0 logMAR | 6/6 Snellen (m) |
| 0.0969 logMAR | 6/7.5 Snellen (m) |
| 0.176 logMAR | 6/9 Snellen (m) |
| 0.301 logMAR | 6/12 Snellen (m) |
| 0.398 logMAR | 6/15 Snellen (m) |
| 0.477 logMAR | 6/18 Snellen (m) |
| 0.544 logMAR | 6/21 Snellen (m) |
| 0.602 logMAR | 6/24 Snellen (m) |
| 0.699 logMAR | 6/30 Snellen (m) |
| 1 logMAR | 6/60 Snellen (m) |
| 1.3 logMAR | 6/120 Snellen (m) |
Quick answers
Quick answers
- How many logMAR is 6/1 Snellen (m)?
- 6/1 Snellen (m) is -0.778151 logMAR.
- How many logMAR is 6/10 Snellen (m)?
- 6/10 Snellen (m) is 0.221849 logMAR.
- How many logMAR is 6/20 Snellen (m)?
- 6/20 Snellen (m) is 0.522879 logMAR.
The units
About these units
Snellen (meters) (Snellen (m))
The UK and metric fraction: 6 meters over the normal distance.
LogMAR (logMAR)
The log of the minimum angle of resolution: 0 is normal, higher is worse.
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