Pattern VEP is an informative method of glaucoma diagnostics which accuracy can be enhanced by combining it with OCT-A blood flow examination.

Decreased OCT-A parameters in non-advanced glaucoma indicate an early reduction of blood supply to the macula and explain the involvement of the latter in the pathological process in POAG.

The study revealed reduction of macular microcirculation and decrease of PERG in early glaucoma. Correlations between the circulatory parameters and functional changes were found in early stages of the disease.