Figure 1.

Outline of the HFA 24-2/30-2 correction method. The superior nasal VF in the left eye of a representative subject is shown. First, the TH values at (3,9) and (9,3) coordinates were predicted from the neighboring TH values, which were predicted with CNN-PBR, and the weights based on the distance to the test points. For example, distances between (1,9) and (3,9), between (1,7) and (3,9), between (3,7) and (3,9), and between (5,7) and (3,9) are$2,2\sqrt{2},2,2\sqrt{2}$, and thus the weights become $\frac{1}{2}:\frac{1}{2\sqrt{2}}:\frac{1}{2}$: $\frac{1}{2\sqrt{2}}=\sqrt{2}$:1:$\sqrt{2}:1.$ Using these weights, the TH value of 10-2 at (3,9) was predicted as follows:

$\frac{30.5\times \sqrt{2}+31.5\times 1+32.4\times \sqrt{2}+32.1\times 1}{\sqrt{2}+1+\sqrt{2}+1}=31.6$

Likewise, the predicted TH value at (9,3) was 30.6. We averaged the TH values at (3,9), (9,3) and (3,3):

$\frac{31.6+30.6+31.2}{3}=31.1$

Second, we averaged the TH value of 24-2 at (3,9), (9,3), and (9.9):

$\frac{30+29+32}{3}=30.3$ Finally, the difference between these values (30.3–31.1 = −0.8) was added to the predicted TH values of 10-2. The corrections in the other quadrants were performed in a similar manner.