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ORIGINAL ARTICLE
Year : 2020  |  Volume : 68  |  Issue : 5  |  Page : 805-811

Comparison of structural and functional tests in primary open angle glaucoma


1 Isparta Suleyman Demirel University Faculty of Medicine Department of Ophthalmology Isparta, Turkey
2 Katip Celebi University Department of Ophthalmology Izmir, Turkey
3 University of Medical Sciences, Gulhane Education and Research Hospital, Department of Ophthalmology, Ankara, Turkey
4 TOBB ETU University Faculty of Medicine Department of Ophthalmology Ankara, Ankara, Turkey
5 DünyaGöz Hospitals Group Ankara/, Turkey

Correspondence Address:
Dr. Umut Karaca
Suleyman Demirel Univercity Faculty of Medicine Department of Ophthalmology Isparta
Turkey
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijo.IJO_921_19

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Purpose: To comparatively analyze the structural and functional tests used in the diagnosis and follow-up of glaucoma. Methods: Eighty eyes of 40 patients with primary open angle glaucoma (POAG) and 46 eyes of 23 healthy individuals were included in the study. Transient pattern electroretinography (PERG), steady-state PERG (ssPERG), computerized visual field (VF) screening, and examination of retinal nerve fiber layer (RNFL) and macular thickness on optical coherence tomography (OCT) were undertaken. The results were compared between the groups. Results: 80 eyes belonging to 40 patients with a diagnosis of POAG (23 female, 17 male) (18 mild 22 moderate POAG) with a mean of 57.37 (±8.6) years, and 46 eyes of 23 healthy individuals (14 female, 9 male) with a mean age of 55.30 (±8.09) years were included in the study. PERG P50 and N95 and ssPERG latency revealed a significant delay in the POAG group. When the wave amplitudes were examined, they were found to be significantly lower in both PERG and sSPERG tests for the POAG group, but the results were more pronounced in ssPERG. The latency values of PERG and ssPERG tests were not significantly correlated with any of the parameters of the remaining tests. However, the amplitude values of these tests had a positive correlation with the mean deviation value and negative correlation with the pattern standard deviation value of VF. All associated parameters were significant for the amplitude value of the ssPERG test. Conclusion: For the proper management of glaucoma, rather than approaching damage simply as the loss of retinal ganglion cells or the neuroretinal rim, it is necessary to focus on the ongoing anatomical and functional relationship and evaluate structural and functional tests together. In addition, ssPERG test, which is not widely adopted in routine practice, provides valuable information and is significantly correlated with OCT parameters.


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