Comparison of ZETA Fast (PTS) (Optopol Technology) and Humphrey SITA Fast (SFA) (Carl Zeiss Meditec) Perimetric Strategies

Figure 2

Bland–Altman plots for the time to complete the test (in seconds). For each subject, the mean of the measurement from the Zeiss and Optopol machines is taken and plotted on the x-axis. The y-axis is the difference between the Optopol and Zeiss measurements. The plot on (a) is for control subjects; the plot on (b) is for subjects with glaucoma.

(a)

(b)