Purpose: To evaluate bioelectrical function of inner retinal layers measured by PERG in normal tension glaucoma.
Patients and methods: In 50 eyes of 30 patients with normal tension glaucoma the following examinations were performed: history, routine ophthalmic examination, standard static perimetry and pattern ERG test.
Results: The most frequent abnormalities were incorrect N95/P50 amplitude ratio and increase latency of N95-wave. In analyzed glaucoma patients sensitivity of PERG test was 50% and specificity 87%.
Conclusions: In normal tension glaucoma, the ganglion cells dysfunction is present and can be detected with PERG test. PERG can be additional useful diagnostic test in patients with normal tension glaucoma, particulary for those with difficult to cooperate.