ABV_Test4

Question 1

Define sensory fusion

Answer 1

Process by which stimuli seen separately by the 2 eyes are combined, synthesized, or integrated into a unitary percept.

Question 2

Define motor fusion

Answer 2

Relative mvts of 2 eyes in response to disparate retinal stimuli, to obtain or maintain simultaneous stimulation of corresponding retinal areas, so that sensory fusion can occur.

Question 3

T/F

AC is a binocular condition

Answer 3

True.
There is normal sensory fusion and anomalous sensory fusion. In both situation; there is binocularity; one is normal correspondence and the other is anomalous correspondence.

Question 4

T/F

1. Targets themselves provide stimulus to sensory position
2. Target position provides stimulus to motor fusion

Answer 4

True to both statemeents.

Consider stimulus to sensory and motor fusion separately.

Question 5

Detail of targets

Answer 5

1. pts with poor motor fusion need detail free targets bcaz targets with very little detail are easier for them to fuse than complex targets
2. Pts with good sensory fusion do better with complex targets than simple targets due to sensory fusion cues; seems to stimulate motor fusion.

Question 6

Define first degree

Answer 6

2 targets with non-fusible contours

Question 7

Define second degree

Answer 7

2 targets with fusible contours and suppression checks for each eye

Question 8

Define third degree

Answer 8

2 targets with fusible contours
has suppression
Has additional disparate fusible contours giving rise to stereopsis.

Question 9

Name some additional parameters to target content

Answer 9

Contrast
Brightness (for suppression)
Similarity (enhances fusion
Color(increases interest)
Interest(increases attention)
Familiarity(helps with fusion)

Question 10

Which trt is performed simultaneously with sensorimotor trt?

Answer 10

Antisuppression therapy.

Question 11

Is diplopia a good thing or bad thing following antisuppression threapy?

Answer 11

A good thing bcaz that means u r breaking down suppression.

Question 12

What is the AS tx goal for a pt that is strabismic?

Answer 12

Establish diplopia

Establish sensory fusion when aligned

Question 13

What is the AS tx goal for a pt that is non-strabismic?

Answer 13

Stabilize sensory fusion

Question 14

Where is suppression likely to begin and likely to be the strongest?

Answer 14

Centrally

Question 15

T/F

Patching breaks suppression

Answer 15

True.

This is a passive method for antisuppression trt.

Question 16

Which position do you use to place target for constant strabs?

Answer 16

Objective angle

Question 17

Which position do you use to place target for intermittent strabs?

Answer 17

Orthoposition

Question 18

List some prognostic factors for trt of AC

Answer 18

Direction
Freq
Magnitude
Type of AC
Presence of stereopsis
Prior surgery: post surgical vs consecutive

Question 19

Name the treatment goals for anomalous correspondence

Answer 19

a. Establishing NC, in the sequence of establishing normal BV
b. Reduce “strength” of anomalous motor fusion, anticipating surgery to improve cosmetic appearance.
PPAT helps u determine the strength of an AMF

Question 20

Name the three general treatment approaches found in trt of AC

Answer 20

1. Motor stimulation method
2. sensory stimulation method
3. disruptive prism method.

Question 21

T/F

AC patients with intermittent strab generally exhibit covariation

Answer 21

True

Question 22

What is covariation

Answer 22

NC when aligned, AC when strabismic.

The AC is HAC

Question 23

T/F

AC has little to no impact on IXT and IET

Answer 23

True.
This is a good prognostic factor
For CET and CXT; AC has a moderate impact. There is only 14% cure rate in CET

Question 24

Name the four disruptive prisms used

Answer 24

1. rotating base therapy
2. Inverse prism therapy
3. Corrective prism therapy
4. Overcorrecting prism therapy.

Question 25

T/F | Once u get pt to do global stereo; there is no need for correspondence testing

Answer 25

true | RDS = fovea to fovea communication

Question 26

T/F | THe Overcorrecting prism therapy is based on anomalous motor fusion

Answer 26

Claro que si.

Question 27

What diagnosis can u find pathologic suppression in

Answer 27

``` Constant strab Intermittent strab Aniso amb Aniseikonia Heterophoria ```

Question 28

Visual ignoring

Answer 28

Represents a passive, unconscious disregard or decreased awareness of a perceived image. There is no scotoma in visual ignoring.

Question 29

Visual confusion

Answer 29

Arises when images of two diff objects placed on corresponding foveae. Seen as being superimposed. Rarely reported bcaz of binoc rivalry that exists b/w the two foveae.

Question 30

T/F | IN XT, it is the temporal region of the retina that is suppressing

Answer 30

True

Question 31

Does shallow suppression occur in natural settings or unnatural settings?

Answer 31

Natural settings In unnatural settings; the pt will less likely suppress. Deep suppression will occur in both natural and unnatural settings.

Question 32

Testing from shallow to deep suppression

Answer 32

``` Freespace Bagolini Vectograph Stereoscope Red Lens Red/Green ```

Question 33

10 pd exo vs 30 pd exo; who is more likely to have suppression

Answer 33

30pd exo. 30pd exo is more likely to be constant. The 10pd exo more likely to be intermittent.