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The impact of structural and functional parameters in glaucoma patients on patient-reported visual functioning
Christoph Hirneiß1, Lukas Reznicek, Michaela Vogel
1Ludwig-Maximilians University, Department of Ophthalmology, Klinikum der Universität Muenchen, Campus Innenstadt, Munich, Germany.
Plos One
|December 7, 2013
Summary
Glaucoma patients' reported visual functioning is better predicted by visual performance than by retinal nerve fiber layer (RNFL) structure. However, RNFL thinning in the worse eye still correlates with functional impairment.
Area of Science:
- Ophthalmology
- Vision Science
Background:
- Glaucoma is a progressive optic neuropathy characterized by retinal nerve fiber layer (RNFL) damage and visual field loss.
- Patient-reported visual functioning is a crucial outcome measure in glaucoma management.
Purpose of the Study:
- To investigate the relationship between structural damage (RNFL thickness) and functional impairment (patient-reported visual functioning) in glaucoma.
- To determine if structural parameters or visual performance better predict patient-reported visual functioning.
Main Methods:
- A cross-sectional study involving 88 glaucoma patients (176 eyes).
- Retinal nerve fiber layer (RNFL) thickness measured using spectral-domain optical coherence tomography (SD-OCT).
- Patient-reported visual functioning assessed with the Glaucoma Activity Limitation 9 (GAL-9) questionnaire; visual field loss evaluated by standard automated perimetry.
Main Results:
- Temporal-superior and temporal-inferior RNFL thinning in the worse eye significantly correlated with GAL-9 scores.
- Visual acuity of the better eye and mean defect of the worse eye were the strongest predictors of GAL-9 scores (R²=0.334).
- Structural parameters did not significantly improve the prediction of GAL-9 scores when visual performance data was included.
Conclusions:
- Visual performance metrics are superior to structural parameters in predicting self-reported visual functioning in glaucoma patients.
- Despite this, specific RNFL structural changes in the worse eye show a significant association with patient-reported functional limitations.
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