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Longitudinal nerve fibre layer thickness change in normal-pressure glaucoma
D Poinoosawmy1, J C Tan, C Bunce
1Glaucoma Research Unit, Moorfields Eye Hospital, City Road, London EC1V 2PD, UK.
Summary
Normal-pressure glaucoma (NPG) patients experience faster retinal nerve fibre layer (RNFL) thinning than healthy individuals. This thinning correlates with visual field deterioration, especially in earlier stages of the disease.
Area of Science:
- Ophthalmology
- Neuroscience
Background:
- Normal-pressure glaucoma (NPG) is a form of glaucoma where intraocular pressure is not elevated.
- Understanding the progression of RNFL thinning in NPG is crucial for patient management.
Purpose of the Study:
- To investigate longitudinal changes in retinal nerve fibre layer (RNFL) thickness in NPG patients.
- To assess the relationship between RNFL thickness changes and visual field parameters in NPG.
Main Methods:
- Serial GDx nerve fibre layer Analyzer II imaging and Humphrey visual fields were performed on NPG patients and normal subjects.
- Measurements were compared between groups at baseline and follow-up (at least 18 months apart).
Main Results:
- NPG patients showed significantly thinner RNFL at baseline compared to controls.
- Greater RNFL thinning occurred in NPG patients over time (P < 0.0001).
- RNFL thinning correlated negatively with visual field mean deviation (MD) at baseline and over time.
Conclusions:
- NPG patients exhibit accelerated RNFL thinning compared to normal subjects.
- Earlier stages of NPG, characterized by better visual fields, showed greater RNFL reduction.
- A direct relationship exists between RNFL thinning and visual field deterioration in NPG.