
Chapter 4 - Capture images
l
eye movement.
l
blinks.
l
media opacities.
l
dry eye.
l
floaters.
l
improper alignment of the eye.
If a local weak signal covers essential parts of the image, for example the fovea, the operator should
document the image as non-evaluable. If a local weak signal does not cover essential parts of the image
the operator should document the image as evaluable.
FIGURE 14: Examples of local weak signal strength.
FIGURE 15: Example of local weak signal near the fovea.
FIGURE 16: Example of local weak signal with acceptable global SNR.
Page 48 of 84
Part Number: G110230-003-ENG
English
Copyright 2019-2021, Optos plc. All rights reserved.