How much NFL loss before VF defects occur?
25-50%
Where do most GLC experts look when examining the optic nerve?
NASAL
According to Bobby, what is the order in which the optic nerve should be evaluated?
- Disc size
- NRR (CDR/thickness, contour, color, margins)
- Vascular changes
- Disc hemorrhages
- Evaluate NFL
- Peripapillary zone
Which nerve is MORE likely to have GLC?
B
Rank the following races in likelihood to have large disc size:
Caucasian, African American, Hispanic
- AA
- Hispanic
- Caucasian
Hyperopes are likely to have ___ and myope are likely to have ___ discs.
Hyperope — Smaller
Myope — Larger
What constitutes a “small disc” size?
< 1.5 mm
What constitutes a “large disc” size?
2.0 mm
What is the conversion size rate for a 78D lens?
1.1 x
What is the conversion size rate for a 90D lens?
1.3 x
What is the mean CDR per disc diameter?
If the CDR is ___ than the mean, pt is a GLC suspect.
< 1.0 — 0.26
1.2 — 0.33
1.4 — 0.39
1.6 — 0.45
1.8 — 0.50
> 2.0 — 0.55
CDR > mean —> suspect
T/F: Laminar dots is indicative of GLC
TRUE
T/F: A drance hemorrhage means there absolutely is GLC progression.
TRUE
In the OHTS study, how many photographed drance hemorrhages were found during fundus exam?
16%
Drance hemorrhage is most likely to be found in what quadrant?
Inf Temp
Where are most drance hemorrhages located in relation to its associated RNFL defect?
2 clock hours away
Which zone of a PPA is more assc with GLC?
Beta zone
The alpha zone is ____ whereas the beta zone is ___
Alpha — outside, farther from nerve
Beta — inside, closer to nerve
Larger beta zone = ___ NRR
Thinner —> assc w/ GLC progress
RNFL includes:
- Axons of GC
- Blood vessels
- Glial tissue
