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000000Ć1150Ć839 IOLMaster 11.02.2004
Signals from the choroid
Triple peaks
In rare cases it may happen that the measuring light is also reflected
from the vessels of the choroid.
Fig. 51 Rare triple peak (triple zoom)
ILM
RPE
0.15 - 0.35 mm
0.15 - 0.25 mm
circ. 0.80 mm
The measuring peak produced by the choroid appears shifted towards
longer axial lengths by approximately 0.15 Ć 0.25
mm from the peak of
pigmented epithelium.
In the example illustrated above, the signal from the RPE (middle peak)
has the highest amplitude. The automatic peak detection system has
correctly placed the cursor here to detect the correct axial length. No
further movement of the cursor is needed. This type of rare triple peak
clearly differs from the secondary maxima produced through the light
source by the distance from the RPE reflected peak (Fig. 51).
Evaluation of ALM results
