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Advanced Optometry Exam 2 > Gonio 2 > Flashcards

Gonio 2 Flashcards

1
Q

anterior curve of goniolens is such that the critical angle is not reached

A 
direct gonio (koeppe) 
truer appreciation of the angle depth 
can be used on sedated patients
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2
Q

In indirect gonio the image is

A

mirror image of the opposite angle
ojects anterior-> periphery
objects posterior - centraly
no change in lateral orientation

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3
Q

what causes suction effect on goldmann gonioscopy

A

the solution and the steep BC of the lens

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4
Q

most common angle of gonio mirrors

A

62 degrees

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5
Q

greater distance of gonio lens results in more

A

tangential view across iris

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6
Q

tilting a gonio lens will change

A

angulation and brings mirror closer to the corneal apex (less tangential)

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7
Q

what can allow you to view over convex iris during gonio

A

tilting the lens

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8
Q

Indentation gonioscopy can be done with a Zeiss gonio lens because

A

it has a small diameter and its possible to indent the cornea and open an angle that is appositionally closed

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9
Q

ability to manipulate the peripheral iris can be helpful in

A

differentiating appositional vs synechial closure

indentation fails to open= synechial closure

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10
Q

since goldmann gonio lens is steeper than the cornea (smaller base curve)

A

solution is used, suction occurs

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11
Q

goldmanns gonio is a ___ mirror design, with diameter __ than corneal and ___ than the cornea.

A

3 mirror
greater diameter than cornea
steeper than cornea

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12
Q

Zeiss is a __ mirror design. With handle (Posner) or without(Sussman). Diameter is ___ than the cornea, BC is ___ compared to the cornea.

A

4 mirror
smaller diameter than the cornea
same BC as the cornea

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13
Q

insertion of Zeiss gonio lens requires patient to look

A

in primary gaze

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14
Q

insertion of golmanns gonio requires patient to look

A

up, lens is inserted in inferior fornix and then tilted on the globe

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15
Q

when performing gonio it is important that the light

A

does not enter the pupil

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16
Q

to examine 4 quadrants with Zeiss you ___. and with Goldman’s you___.

A

zeiss-> shift view from mirror to mirror

goldmanns-> rotate the lens

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17
Q

during gonio you have to identify the most __ visible angle structure

A

posterior

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18
Q

which quadrant is usually the deepest during gonio

A

inferior is deepest and superior is shallowest

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19
Q

corneal wedge is used to identify

A

SL

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20
Q

Removing lenses during gonio. For Zeiss ___. For Goldmanns ___.

A

zeiss-> simply lifting lens

goldmans-> use second hand to break seal, press through inferior lid at edge of lens

21
Q

___ is the visual landmark with maximum angle orientation

A

scleral spur

if not located assume abnormal angle

22
Q

outflow anterior to the spur is ___ and uveoscleral outflow is ___.

A
  • trabecular

- posterior

23
Q

for rapid orientation during gonio first look for the

A

scleral spur

24
Q

look for ____ in the pupillary border during gonio

A

blood vessels, iris cysts , dandruff like particles

25
Q

iris can insert anywhere between

A

CB and the cornea

26
Q

3 things to check in peripheral iris during gonio

A

where iris inserts, configuration , angular approach

27
Q

the geometric ACA is formed by

A

angle formed by a tangent drawn at the level of the trabecular meshwork and the peripheral iris face

28
Q

CB difference between myopes and hyperopes

A

narrow in hyperopes

wider in myopes

29
Q

when is the ciliary band not seen

A

if the iris insert directly into the scleral spur

30
Q

in angle recession you can usually see

A

a very wide and sometimes irregular ciliary body band

31
Q

most notable landmark

A

scleral spur

32
Q

inability to locate ss suggest

A

the angle may be closed (appears as a white circumferential band)

33
Q

if unable to identify spur you can try to locate schwalbes by

A

performaing corneal wedge

34
Q

note degree of Trabecular pigmentation with

A

scale of 0-4+

unusually heavy or asymmetric pigmentation may suggest an abnormality

35
Q

pigmented TM is located ___ to sclemms

A

directly adjacent to schlemms

non pigmented is anterior to schlemms

36
Q

anterior limit of the TM

A

scwalbes line

37
Q

identifiable where the anterior and posterior limits of the corneal wedge meet

A

corneal wedge

38
Q

pigment deposition along schwalbes line often seen in pigment dispersion syndrome

A

sampaolesi line

39
Q

congenital prominence of schwalbes

A

posterior embryotoxon

40
Q

peripheral chamber depth is measured

A

with van herick

in the vicinity if the limbus

41
Q

central chamber depth is measured

A

in the vicinity if the corneal apex

42
Q

in most eyes, a shallow central chamber will predict

A

a narrow peripheral chamber

43
Q

Plateau iris syndrome : abnormal anatomic configuration of iris resulting ___ central chamber and ___ peripheral chamber

A

deep central chamber
shallow peripheral chamber
(when the pupil is dilated it may close angle despite patent iridotomy)

44
Q

ACG is possible if iris plateau is

A

at or above TM

45
Q

shallow anterior chamber depth is ____ to develop ACG

A

necessary but not sufficient

46
Q

traditional definition of an occludable angle

A

inability to visualize the pigmented meshwork in 2 quadrants without indentation

47
Q

abnormality where chamber is deep centrally but narrow peripherally

A

plateau iris

48
Q

pupil block is

A

resistance to aqueous flow through the pupil causes it to accumulate in the posterior chamber

49
Q

iris cyst can cause

A

uneven narrowing of the angle by displacing the iris anteriorly

Advanced Optometry Exam 2 (4 decks)

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