Local Relationship between Global-Flash Multifocal Electroretinogram Optic Nerve Head Components and Visual Field Defects in Patients with Glaucoma

Figure 2

Calculations of overlapping rates between ONHC deficiency maps and visual field defect plots at different stages of functional loss. Areas of visual field defects were extracted from the total deviation plots in each of the four stages: visual sensitivities lower than 5%; lower than 2%; lower than 1%; and lower than 0.5%. ONHC deficiency maps were extracted from the ONHC ratio maps in each of the four stages: ONHC ratio lower than 0.5; lower than 0.3; lower than 0.2; and lower than 0.1. Four visual field defect plots and four ONHC deficiency maps were overlapped for each comparison and the spatial agreement between the ONHC deficiencies and visual field defects was evaluated by calculating rate of overlapping area.