Optic Nerve Flashcards

1
Q

How much NFL loss before VF defects occur?

A

25-50%

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2
Q

Where do most GLC experts look when examining the optic nerve?

A

NASAL

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3
Q

According to Bobby, what is the order in which the optic nerve should be evaluated?

A
  1. Disc size
  2. NRR (CDR/thickness, contour, color, margins)
  3. Vascular changes
  4. Disc hemorrhages
  5. Evaluate NFL
  6. Peripapillary zone
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4
Q

Which nerve is MORE likely to have GLC?

A

B

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5
Q

Rank the following races in likelihood to have large disc size:
Caucasian, African American, Hispanic

A
  1. AA
  2. Hispanic
  3. Caucasian
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6
Q

Hyperopes are likely to have ___ and myope are likely to have ___ discs.

A

Hyperope — Smaller
Myope — Larger

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7
Q

What constitutes a “small disc” size?

A

< 1.5 mm

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8
Q

What constitutes a “large disc” size?

A

2.0 mm

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9
Q

What is the conversion size rate for a 78D lens?

A

1.1 x

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10
Q

What is the conversion size rate for a 90D lens?

A

1.3 x

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11
Q

What is the mean CDR per disc diameter?

If the CDR is ___ than the mean, pt is a GLC suspect.

A

< 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

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12
Q

T/F: Laminar dots is indicative of GLC

A

TRUE

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13
Q

T/F: A drance hemorrhage means there absolutely is GLC progression.

A

TRUE

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14
Q

In the OHTS study, how many photographed drance hemorrhages were found during fundus exam?

A

16%

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15
Q

Drance hemorrhage is most likely to be found in what quadrant?

A

Inf Temp

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16
Q

Where are most drance hemorrhages located in relation to its associated RNFL defect?

A

2 clock hours away

17
Q

Which zone of a PPA is more assc with GLC?

A

Beta zone

18
Q

The alpha zone is ____ whereas the beta zone is ___

A

Alpha — outside, farther from nerve
Beta — inside, closer to nerve

19
Q

Larger beta zone = ___ NRR

A

Thinner —> assc w/ GLC progress

20
Q

RNFL includes:

A
  1. Axons of GC
  2. Blood vessels
  3. Glial tissue