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The 'two global flash' mfERG in high and normal tension primary open-angle glaucoma
Anja M Palmowski-Wolfe1, Margarita G Todorova, Selim Orguel
1Department of Ophthalmology, University Eye Hospital, Mittlere Strasse 91, 4012, Basel, Switzerland. palmowskia@uhbs.ch
Documenta Ophthalmologica. Advances in Ophthalmology
|December 13, 2006
Summary
The "2 global flash" multifocal electroretinogram (mfERG) effectively detects glaucoma. This method distinguishes both normal tension (NTG) and primary open-angle glaucoma (POAG) patients from healthy controls.
Area of Science:
- Ophthalmology
- Neuroscience
- Visual electrophysiology
Background:
- Glaucoma is a progressive optic neuropathy characterized by vision loss.
- Early detection of glaucomatous dysfunction is crucial for preserving vision.
- Multifocal electroretinography (mfERG) is a tool used to assess retinal function.
Purpose of the Study:
- To evaluate the sensitivity of the '2 global flash' mfERG technique.
- To detect glaucomatous dysfunction in patients with normal tension glaucoma (NTG) and primary open-angle glaucoma (POAG).
Main Methods:
- mfERGs were recorded from 20 NTG, 20 POAG patients, and 20 controls.
- A 103-hexagon array was used with a focal flash followed by two global flashes.
- Focal scalar products (SP) were analyzed, focusing on the direct component (DC) and induced components (IC-1, IC-2) at specific time intervals.
Main Results:
- Both NTG and POAG patients showed significant differences from controls in the IC-1 response of superior quadrants.
- The IC-1 of the superior temporal quadrant was the most sensitive parameter (ROC AUC 0.82 for POAG, 0.79 for NTG).
- The IC-1 analysis correctly classified 90% of NTG and 85% of POAG patients as abnormal, and 80% of controls as normal.
Conclusions:
- The '2 global flash' mfERG stimulus sequence shows promise for diagnosing early functional changes in glaucoma.
- This mfERG approach can differentiate both NTG and POAG patients from healthy control subjects.
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