DIS - Open Angle Glaucoma II - Week 3 Flashcards
Why can drance haemorrhaging occur?
Loss of glial support leads to vascular compromise
Define drance haemorrage.
Any haemorrhage up to 1 DD away from the disc
What can drance haemorrhages precede (2) and by how many years?
Can precede VF and RNFL loss by 2-5 years
What is a very common casue of drance haemorrages?
High systemic blood pressure
Are drance haemorrhages easy to spot or easy to miss?
Easy to miss
What effect does losses in neural tissue have on blood vessels?
they kink
How does PPA occur?
Loss of deep choroidal blood flow gives overlying atrophy
What type of glaucoma is PPA common in?
Low tension glaucoma
What should be noted with gliosis and the B/D/B feature of the RNFL?
Gliosis can give sheen in advanced loss
When assessing B/D/B for RNFL, do you see individual nerves?
no, you see bundles
Which section appears darkest when assessing B/D/B RNFL?
Nasald
What is B/D/B RNFL harder to detect with (3)?
Catarac
Age
High myopia
Can you have localised loss with B/D/B RNFL or only generalised loss?
Yes, you get a wedge loss appearance
What clinical procedure is best for advanced/severe cases of glaucoma?
Visual fields
Must all methods be used for detection? List them (4) and note which is better.
RNFL OCT
Macula GCC OCT
ON appearance OCT/photo
Visual fields
RNFL OCT is better than NRR photos