This image shows the Total Deviation (Defect depth) in a curve. The values are sorted: On the left are the good values, on the right the bad values. Because of normal scattering, even in a normal visual field some values are above 0 and some below. If the curve leaves the normal range, the color turns red (defects) or green (supernormal values).
The indices MD, PSD and LV are the mean value and the spread values of this curve
local depression: Only a part of the values is depressed. The right part of the curve is lowered and red (see example)
diffuse depression: All values are evenly diminished. The whole curve is shifted downwards and red
mixed depression: All values are diminished, some more, some less. The whole curve is shifted downwards and the slope is increased. The whole curve or at least the right part is red
False positive response behavior: The values are elevated. The left side of the curve or the entire curve is shifted upwards and parts of it are green.
Defect depth or total deviation are norm-related values. A normal value has 0 dB -- Click here for more information about this value type, the meaning and interpretation