Private and commercial driving visual-field standards

A private driver, a commercial driver, a heavy vehicle driver, and a bus driver do not create the same public-risk context. Austroads therefore separates standards and clinical considerations by licence class.

In clinic, this means the field cannot be interpreted in isolation. A field that might support private conditional consideration may still be unsuitable for commercial driving. The patient may not realise this, so ask early and document clearly.

DRIVE Fields keeps licence class visible because it changes both the threshold and the tone of the report.

For private driving, the cleanest result is an unconditional field with at least 110 degrees horizontal extent and no unacceptable central or encroaching defect, provided reliability is satisfactory.

If the horizontal extent is below 110 degrees but at least 90 degrees, Austroads allows an optometrist or ophthalmologist to support conditional consideration by the driver licensing authority. That is not the same as saying the patient has passed. It means the clinician can describe why a conditional licence may be reasonable in context.

Below 90 degrees, the field falls outside that private conditional visual-field pathway. In practice, that should trigger a cautious discussion and authority review rather than creative wording.

Commercial driving is treated differently because the driving task, exposure, vehicle size, passenger responsibility, and public risk may be greater. Austroads is much less flexible for commercial drivers with visual-field defects.

A commercial field generally needs at least 140 degrees horizontal extent, satisfactory acuity, and no other field loss likely to impede driving. Even then, clinical judgement and authority decision-making remain central.

If the patient is a professional driver, spend extra time on reliability, printout clarity, progression risk, and whether the driving task involves long distances, night driving, heavy vehicles, passengers, or complex road environments.

A conditional licence can include requirements such as corrective lenses, periodic review, daylight driving only, local-area restrictions, avoidance of freeway or motorway driving, or other authority-selected conditions. The exact condition is not chosen by DRIVE Fields.

The clinician can provide information that helps the authority decide: duration of defect, stability, adaptation, visual acuity, field extent, central pattern, driving history, usual driving radius, and whether the driving task is routine or high-risk.

The most useful clinician wording is specific and humble. For example: the field is borderline for unconditional private driving but may support conditional consideration if the authority accepts the clinical context. That is stronger than a vague statement that the patient is safe to drive.

In a longstanding stable private-driver defect, useful documentation might mention duration, stability, absence of progression, patient adaptation, usual driving distance, and lack of recent driving incidents. In a recent neurological defect, the same field extent may be much less reassuring.

In a commercial-driver case, documentation should be even clearer about the measured threshold and any uncertainty. If reliability is missing, repeat the test or escalate rather than burying the limitation.

If the patient needs a form completed urgently, resist the pressure to turn uncertainty into certainty. A manual-review recommendation is often better medicolegally and clinically than a weak favourable report.

Driving restrictions can feel threatening, especially for patients who depend on driving for work or independence. A calm explanation helps: the role of the clinician is to assess and report vision; the licensing authority makes the decision; and conditional pathways can sometimes preserve safe, limited driving.

Avoid framing the conversation as the app passing or failing the patient. The app is a calculator and explanation tool. The clinical assessment is broader.

When a result is borderline, explain what would make the evidence stronger: repeat reliable field, clearer printout, source device confirmation, specialist opinion, or authority review.