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Rarebit perimetry for bedside testing: comparison with standard automated perimetry
Samuel K Steven Houston1, Eric D Weber, Sebastian F Koga
1University of Virginia School of Medicine (SKSH), Charlottesville, Virginia 2290, USA.
Summary
Rarebit perimetry (RBP) offers a convenient bedside alternative for visual field testing. This method proved as sensitive as standard automated perimetry (SAP) and identified defects missed by SAP.
Area of Science:
- Ophthalmology
- Neurology
- Medical Technology
Background:
- Rarebit perimetry (RBP) is a technique for detecting early afferent visual system damage.
- RBP has not been widely evaluated for bedside use.
- Standard automated perimetry (SAP) is typically performed in a clinic setting.
Purpose of the Study:
- To assess the feasibility of bedside RBP.
- To compare bedside RBP with clinic-based SAP.
- To evaluate RBP's utility in patients with neurological conditions.
Main Methods:
- 29 eyes from 15 patients with neurological or neurosurgical conditions were tested.
- Bedside RBP was conducted using a laptop computer.
- Standard automated perimetry (SAP) was performed subsequently in a clinic.
- Results were assessed by a masked neuro-ophthalmologist.
Main Results:
- Visual fields from RBP and SAP correlated in 72% of tested eyes.
- RBP identified visual field defects in 5 subjects with normal SAP results.
- Patients reported a preference for the convenience of bedside RBP.
Conclusions:
- Rarebit perimetry is a feasible and convenient method for bedside visual field testing.
- Bedside RBP demonstrates comparable sensitivity to SAP for detecting visual field defects.
- RBP may be a valuable tool for early detection of visual system damage at the bedside.