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Snellen Visual Acuity Interpretation

Interprets Snellen chart visual acuity measurements. Standard notation: 6/x metres (UK) or 20/x feet (US). Used to screen for visual impairment, assess driving eligibility, and guide referral to ophthalmology.

Test distance (numerator) — usually 6 metres (UK) or 20 feet (US)*

Smallest line read correctly (denominator) — select the number on the line patient reads*

Measured with or without correction*

References

Snellen H. Probebuchstaben zur Bestimmung der Sehschärfe. Utrecht: Van de Weijer, 1862.
DVLA. Assessing fitness to drive: a guide for medical professionals. UK Driver and Vehicle Licensing Agency. 2023.

Curated clinical cross-links plus same-class fallbacks.

Calculators

Ishihara Colour Vision Test Interpretation · Ophthalmology

Drugs

Tetracosactide · Synthetic ACTH (short Synacthen test)
Urea (13C) · 13C-urea breath test

Pathways

Epistaxis Management · ENT-UK / NICE
Acute Otitis Media · NICE NG91 2018
Tonsillitis and Sore Throat · NICE NG84 2018
Benign Paroxysmal Positional Vertigo · NICE CG124 / AAO-HNS Guidelines
Acute Rhinosinusitis · NICE NG79 2017 / EPOS 2020
Peritonsillar Abscess (Quinsy) · ENT-UK / SIGN guidelines

Decision support only — verify against MDCalc, NICE, or your local guideline before clinical use.

References

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