Snellen Visual Acuity Interpretation
Interprets Snellen visual acuity measurements and converts to LogMAR equivalents
- Highest activation tier
- Available
- How it is scored
- Scored in code; a stated value is compared only from the structured summary or a supplied value
- Scoring type
- formula
- Care settings
- Any setting
When it activates
Scribeable activates a calculator from the encounter. The Snellen Visual Acuity Interpretation can activate when the transcript or pasted chart context documents any of these:
- Visual acuity interpretation
- Vision assessment
- Legal blindness determination
A coded diagnosis can also activate it. ICD-10 prefixes carried by the registry: H54.
Inputs the note needs
1 input. Each is resolved from the transcript, the pasted chart context and charted labs; at this calculator’s tier a missing input is never requested, and the code-scoring engine never inserts the score unprompted.
| Input | Type | Unit / options | Guidance |
|---|---|---|---|
| Snellen denominator (e.g., 20 for 20/20, 200 for 20/200) | exam |
Scoring
LogMAR = log10(denominator/20). 20/20=0.0, 20/40=0.3, 20/70=0.54, 20/200=1.0.
Interpretation
20/20 (LogMAR 0.0): Normal vision. 20/40 (0.3): Mild vision loss — driving standard in most states. 20/70 (0.54): Moderate vision loss. 20/200 (1.0): Legal blindness.
Evidence
Sources carried in Scribeable's citation registry for this calculator; guideline version: Standard.
- Snellen H. Optotypi ad Visum Determinandum (Snellen Visual Acuity Chart)Snellen Visual Acuity · 1862 · link last verified 2026-03-28
How Scribeable handles it in the note
Scribeable can list the Snellen Visual Acuity Interpretation as available to the note when the clinician's specialty matches and the encounter activates it. Its highest activation tier is available: you are never asked for its inputs, and the code-scoring engine never inserts it into the draft unprompted.
The registry entry carries the inputs, scoring criteria and interpretation above so a score you state is documented against the same reference.
Classified as a staging or classification system: activated strictly, because a wrong stage on the wrong patient is a documentation hazard.
See it activate on your own encounter
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