Acquire Scans
Stratus OCT User Manual PN 2660021134133 A
3-12
Note that media problems associated with many retinal diseases (vitreous opacities,
hemorrhages, lens opacities, etc.) can make it impossible to achieve a signal strength of 5,
even with careful scanning. Nevertheless, such scans can be useful for visual analysis of
the retinal structure and the association between the retinal layers. In assessing retinal
status, visual analysis of the retinal structure is important and may be highly indicative.
Furthermore, if you find that the retinal layer boundaries (white lines generated by the
analysis algorithm) clearly conform to the visible tissue contours, the resulting
measurements are reliable, even if the signal strength is below 5. At the same time, when
the retinal layer boundaries do not conform to the visible tissue contours, the resulting
measurements will not be accurate in those areas, even if the signal strength is 7 or
greater. Note that the RNFL boundary can be difficult to identify, so analysis of RNFL
images with a signal strength below 5 is not recommended.
Scan Messages
The scan messages “Scan too high,” “Scan too low” and “Scan missing data” are
descriptive of what you see on screen. When the scan is too high or too low on the screen,
the analysis algorithm frequently fails. When either message appears, the operator should
repeat the scan, using the Z-Offset arrow buttons to raise or lower the scan image as
necessary. When data is missing, usually from a patient's blink, the scan image is
incomplete and unsuitable for analysis. The operator should repeat the scan, instructing
the patient not to blink during scan acquisition.
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