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Perimetry in glaucoma
Glaucoma
Key Points
- •The 24-2 SITA strategy is the gold standard for glaucoma VF testing; the 10-2 pattern provides high-density macular assessment for early paracentral defects and advanced disease.
- •Reliability indices must be checked first: fixation losses <20%, false positives <15%, false negatives <33% - an unreliable VF cannot be interpreted.
- •The pattern deviation plot is the most important plot for detecting glaucomatous VF loss - it filters out generalised depression (e.g., from cataract) and highlights focal defects.
- •Structure-function dissociation: 25–40% of RGCs may be lost before SAP detects a VF defect - OCT detects structural damage earlier; both tests are complementary.
- •GPA (Guided Progression Analysis) and VFI trend analysis are the standard progression detection methods - a rate of >−1% VFI/year suggests clinically significant progression.
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- Definition
- Epidemiology
- Aetiology and causes
- Pathogenesis
- Classification
- Risk factors and associations