ABV_Test4 Flashcards
Define sensory fusion
Process by which stimuli seen separately by the 2 eyes are combined, synthesized, or integrated into a unitary percept.
Define motor fusion
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.
T/F
AC is a binocular condition
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.
T/F
- Targets themselves provide stimulus to sensory position
- Target position provides stimulus to motor fusion
True to both statemeents.
Consider stimulus to sensory and motor fusion separately.
Detail of targets
- pts with poor motor fusion need detail free targets bcaz targets with very little detail are easier for them to fuse than complex targets
- Pts with good sensory fusion do better with complex targets than simple targets due to sensory fusion cues; seems to stimulate motor fusion.
Define first degree
2 targets with non-fusible contours
Define second degree
2 targets with fusible contours and suppression checks for each eye
Define third degree
2 targets with fusible contours
has suppression
Has additional disparate fusible contours giving rise to stereopsis.
Name some additional parameters to target content
Contrast Brightness (for suppression) Similarity (enhances fusion Color(increases interest) Interest(increases attention) Familiarity(helps with fusion)
Which trt is performed simultaneously with sensorimotor trt?
Antisuppression therapy.
Is diplopia a good thing or bad thing following antisuppression threapy?
A good thing bcaz that means u r breaking down suppression.
What is the AS tx goal for a pt that is strabismic?
Establish diplopia
Establish sensory fusion when aligned
What is the AS tx goal for a pt that is non-strabismic?
Stabilize sensory fusion
Where is suppression likely to begin and likely to be the strongest?
Centrally
T/F
Patching breaks suppression
True.
This is a passive method for antisuppression trt.
Which position do you use to place target for constant strabs?
Objective angle
Which position do you use to place target for intermittent strabs?
Orthoposition
List some prognostic factors for trt of AC
Direction Freq Magnitude Type of AC Presence of stereopsis Prior surgery: post surgical vs consecutive
Name the treatment goals for anomalous correspondence
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
Name the three general treatment approaches found in trt of AC
- Motor stimulation method
- sensory stimulation method
- disruptive prism method.
T/F
AC patients with intermittent strab generally exhibit covariation
True
What is covariation
NC when aligned, AC when strabismic.
The AC is HAC
T/F
AC has little to no impact on IXT and IET
True.
This is a good prognostic factor
For CET and CXT; AC has a moderate impact. There is only 14% cure rate in CET
Name the four disruptive prisms used
- rotating base therapy
- Inverse prism therapy
- Corrective prism therapy
- Overcorrecting prism therapy.
T/F
Once u get pt to do global stereo; there is no need for correspondence testing
true
RDS = fovea to fovea communication
T/F
THe Overcorrecting prism therapy is based on anomalous motor fusion
Claro que si.
What diagnosis can u find pathologic suppression in
Constant strab Intermittent strab Aniso amb Aniseikonia Heterophoria
Visual ignoring
Represents a passive, unconscious disregard or decreased awareness of a perceived image.
There is no scotoma in visual ignoring.
Visual confusion
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.
T/F
IN XT, it is the temporal region of the retina that is suppressing
True
Does shallow suppression occur in natural settings or unnatural settings?
Natural settings
In unnatural settings; the pt will less likely suppress.
Deep suppression will occur in both natural and unnatural settings.
Testing from shallow to deep suppression
Freespace Bagolini Vectograph Stereoscope Red Lens Red/Green
10 pd exo vs 30 pd exo; who is more likely to have suppression
30pd exo.
30pd exo is more likely to be constant.
The 10pd exo more likely to be intermittent.
