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Visual field assessment and the Austroads driving standard
Isabel M McLean1, Elisabeth Mueller, Robert G Buttery
1Centre for Eye Research Australia, Department of Ophthalmology, University of Melbourne, Royal Victorian Eye and Ear Hospital.
Clinical & Experimental Ophthalmology
|March 12, 2002
Summary
Conventional visual field tests may overestimate driving impairment in glaucoma patients. Some patients with severe defects on Humphrey 24-2 testing may still pass the Goldmann driving standard, highlighting the need for further assessment.
Area of Science:
- Ophthalmology
- Optometry
- Public Health
Background:
- Glaucoma is a leading cause of irreversible blindness.
- Visual field testing is crucial for assessing driving eligibility in patients with glaucoma.
- Current automated perimetry may not perfectly align with driving standards.
Purpose of the Study:
- To compare Humphrey 24-2 automated visual field testing with the Goldmann standard for driving assessment.
- To predict the proportion of glaucoma patients who may not meet Australian driving visual field standards.
Main Methods:
- Four patients with severe visual field defects underwent both Humphrey 24-2 and Goldmann IV4e testing.
- 48 glaucoma patients from the Glaucoma Inheritance Study in Tasmania were assessed using both methods.
Main Results:
- Patients with severe defects on Humphrey 24-2 testing met the Goldmann driving standard.
- 15 of 48 patients (31.25%) showed visual field defects on Humphrey 24-2 potentially below the driving standard.
- Only 5 of these 48 patients (10.4%) failed the Goldmann driving standard, with two still driving.
Conclusions:
- Severe visual field defects on conventional automated perimetry do not always mean failing the Goldmann driving standard.
- Around 30% of glaucoma patients may require further testing to confirm driving eligibility based on Humphrey 24-2 results.
- Approximately 10% of glaucoma patients tested did not meet the visual field driving standard.