AV Patterns - COMPLETE

Question 1

Alphabet Patterns

Answer 1

Significant change in horizontal deviation from upgaze, primary, and down gaze

a form of horizontal incomitancy

Question 2

A Patten — more _____ (converged/diverged) in up gaze and more _____ (converged/diverged) in down gaze

Answer 2

A Patten — more converged in up gaze and more diverged in down gaze

Question 3

V Patten — more _____ (converged/diverged) in up gaze and more _____ (converged/diverged) in down gaze

Answer 3

V Patten — more diverged in up gaze and more converged in down gaze

Question 4

Y-Pattern

Answer 4

Y Patten — more divergedin up gaze and ortho in primary and down gaze

Question 5

λ-Pattern

Answer 5

λ-Patten — ortho in primary and up gaze, more diverged in down gaze

Question 6

V-Pattern is characterized by OVER-action of

Answer 6

Inferior Oblique

Question 7

V-Pattern is characterized by UNDER-action of

Answer 7

Superior Oblique

Question 8

A-Pattern is characterized by OVER-action of

Answer 8

Superior Oblique

Question 9

A-Pattern is characterized by UNDER-action of

Answer 9

Inferior Oblique

Question 10

What abnormalities would result in an anatomical A or V Pattern strabismus?

Answer 10

Abnormalities of the bony orbit or insertions of muscle tendons

Question 11

Example:
Up gaze: Ortho
Primary: 10 IET
Down gaze: 35 ET

Answer 11

V Pattern ET

Question 12

Example:
Up: 45 XT
Down: 10 XT

Answer 12

V Pattern XT

Question 13

Example:
Up: 50 IET
Primary: 40 ET
Down: Ortho

Answer 13

A Pattern ET

Question 14

Example:
Up: Ortho
Primary: 10 IXT
Down: 30 XT

Answer 14

A Pattern XT

Question 15

For A-Patterns, ET ____ (increases/decreases) in up gaze

Answer 15

Increases

Question 16

For V-Patterns, ET ____ (increases/decreases) in up gaze

Answer 16

Decreases

Question 17

For A-Patterns, XT ____ (increases/decreases) in up gaze

Answer 17

Decreases

Question 18

For V-Patterns, XT ____ (increases/decreases) in up gaze

Answer 18

Increases

Question 19

For A-Patterns, ET ____ (increases/decreases) in down gaze

Answer 19

Decreases

Question 20

For V-Patterns, ET ____ (increases/decreases) in down gaze

Answer 20

Increases

Question 21

For V-Patterns, XT ____ (increases/decreases) in down gaze

Answer 21

Decreases

Question 22

For A-Patterns, XT ____ (increases/decreases) in down gaze

Answer 22

Increases

Question 23

X Pattern
Definition and cause

Answer 23

Divergence in both up and down gaze but ortho in primary

OVERaction of both IO and SO

Question 24

List frequency of Alphabet Patterns from most to least prevalent

Answer 24

1. V-Pattern ET
2. A-Pattern ET
3. V-Pattern XT
4. A-Pattern XT

Question 25

Which is more common: A or V pattern?

Answer 25

V-Pattern (2x more prevalent)

Question 26

3 Symptoms/Clinical Findings of AV Patterns

Answer 26

1. Asthenopia
2. Diplopia
3. Anomalous Head Posture

Question 27

Chin down promotes using ______ (upgaze/downgaze) and is helpful for what 2 alphabet strabs?

Answer 27

Promotes upgaze

V Pattern ET or A Pattern XT

Question 28

Chin up promotes using ______ (upgaze/downgaze) and is helpful for what 2 alphabet strabs?

Answer 28

Promotes downgaze

V Pattern XT or A Pattern ET

Question 29

Surgery options for Management of Alphabet Patterns

Answer 29

Operate on obliques or vertical transposition of horizontal recti

Question 30

If a patient has Alphabet Pattern strab, when would you consider VT?

Answer 30

• If pt has workable Fusional ranges
• esp if IXT with only small/moderate XT in primary