Austroads visual-field requirements for driving in Australia

Austroads Assessing Fitness to Drive is written for health professionals and driver licensing authorities. It is not a simple pass/fail chart. It gives standards, clinical considerations, and management pathways so that licensing authorities can balance safety, independence, and the specific driving task.

For visual fields, the clinician is usually being asked a narrower question: does the tested field support a private or commercial driving opinion, and are there reliability or pattern features that should prevent a confident favourable opinion? The licensing authority still makes the final decision. A good report therefore separates the measured field result from the legal licensing outcome.

DRIVE Fields is designed around that separation. It can calculate rule-based findings from the clinician-entered points, but the output should still be read beside the original printout, the patient history, the licence class, and any authority form.

Austroads allows confrontation as a screen only when there is no clinical indication of visual-field impairment and no progressive eye condition. It also describes confrontation as inexact. In practical terms, confrontation is not a way to measure a 90, 110, or 140 degree threshold.

Monocular automated static perimetry can be sufficient when there is no field concern and no progressive risk, and the field shows no defect. Once there is a suspected or known defect, a progressive eye condition, or any uncertainty about the driving standard, the assessment moves toward binocular Esterman or a demonstrated equivalent.

The key clinical mistake is using the wrong test for the question. A 24-2 or 30-2 may be excellent for disease monitoring, but it does not by itself answer the binocular driving-field extent question. Conversely, an Esterman is not a substitute for glaucoma progression analysis.

Horizontal extent is one of the headline numbers because it maps naturally to the driving task. Austroads describes normal binocular field as wider than the minimum standards, and it sets different expectations for private and commercial licensing.

For private driving, an unconditional field needs at least 110 degrees of horizontal extent if the other visual-field rules are satisfied. A field from 90 to 109 degrees is not an unconditional pass; it is a zone where an optometrist or ophthalmologist may support conditional consideration by the driver licensing authority. Below 90 degrees is outside that private conditional pathway.

For commercial driving, the threshold is stricter. DRIVE Fields treats commercial cases conservatively because Austroads states there is no flexibility in the same way for commercial drivers. If commercial driving is involved, the report should slow down and make the licence class visible.

Austroads does not treat every missed point within the central 20 degrees equally. Scattered single missed points, or a single small adjoining cluster up to three points, can be acceptable. A larger connected cluster, or a cluster of three plus another separate central miss, is different.

The clinical reason is intuitive. Central and paracentral defects can affect the ability to detect, identify, and respond to hazards even when the far horizontal edge looks acceptable. A field can look wide but still be unsafe if the defect encroaches close to fixation in the wrong pattern.

This is why DRIVE Fields reports cluster behaviour rather than only a total missed-point count. A total score can hide the difference between scattered artefact and a coherent central defect.

Austroads requires fixation monitoring to be performed and recorded for standard binocular Esterman or equivalent testing, and the false-positive score must be no more than 20 percent for the test to be considered reliable for licensing.

If reliability is missing, a favourable-looking pattern should not be upgraded into a confident pass. The correct teaching point for registrars and optometrists is that reliability is part of the result, not a footnote after the result.

Roving Esterman is a special case. It is binocular Esterman testing without fixation monitoring, and Austroads describes a stricter pathway requiring two consecutive tests with limited false positives and numeric point-by-point output. It should not be used as a casual workaround for poor fixation.

A manual-review outcome is not a failure of the app. It is often the most clinically honest answer. It means the entered information does not support a deterministic, source-traceable favourable result.

Manual review is appropriate when the device layout is uncertain, reliability metadata are missing, the licence class is high stakes, the pattern looks neurological, the patient is monocular or recently monocular, or the field is close to a threshold where small entry errors matter.

For teaching, the best use of DRIVE Fields is not to outsource judgement. It is to make the reasoning explicit enough that a clinician can see exactly why a result is routine, borderline, unreliable, or not safely classifiable.