OCT Posterior Seg. Flashcards
what 4 things you need to immediately look at BEFORE anything thing else?
I need to look at quality.
- signal strength needs to be 7/10
- B-scan pics need to border red line and (inner black line needs to meet)
- Floater or opacity being recognized as retina
- Movement on the black and white picture.
the ganglion cell printout OCT includes the ganglion cell area and the Inner plexiform layer. true or false.
true.
which test would you want to do a OCT A ?
amd and diabetic ret
whats an oct a?
the a stands for angiography. its looking at blood flow..
what does the signal strength tell you about quality ? in other words what is the signal strength measuring
Pupil
Dry eye / tear film instability
Cataract
Corneal opacity
a floater can cause what effects on the oct print out
Overestimation of rim and disc areas and
• Decentration of the scan taken with the
RNFL scan
what would happen if I only looked at signal strength on a oct printout?
I would miss other quality factors such as floaters casting a shadow and eye movement.
what are the operator dependent factors affecting quality?
decentration of the macula
t/f. on the oct if it says fovea is NOT FOUND this ALWAYS Indicates I was not centered over the fovea
false. it can also show this message because of pathology like a epiretinal membrane . ** EXAM QUESTION.
macular scans…what anatomical feature can affect machine dependent factors on quality
the papiollomacualr bundle.
It makes the infer, inferior temporal more sensitive because the way the papipular macular bundle is stretching it may not pick up superior area, hence making the area that it is picking up more sensitive.
the normative data can be red but it can red in both directions both in the low direction or the high direction. T/F
true
when should youconider if oct angle is closed or not
if its closed in more than two quads.
gonio is always less that what oct angle measures
false. we tend to over estimate on gonion and the oct tells us the angle may be narrow.
