Microtropia notes

Question 1

General

Answer 1

Small angle <10 c ARC
Common
Stabl e
Anisometropia common
px always mildy amblyopic
central suppression
good but nor perfect Bsv
strong motor fusion

Question 2

investigations

Answer 2

1. VA
2. Crowding point
3. Fixation
4. Covertest
5. 4^D covertest
6. Bagolini glasses
7. Amsler

Question 3

4^ test results

Answer 3

Normal Binoc SV - Lemakes movement to apex (nasally), RE makes version movement

Central suppression
- When the LE is shown the prism the RE makes no version movement
- When the RE is shown prism the Le makes a vergence movement to overcome 4^ as in suppression scotoma

Question 4

Microtropia with identity

Answer 4

No movement on covertest
Harmonious ARC
Subjective angle = 0
Absolute eccentric fixation
Angle of anomaly = Angle of eccentricity
Visualscope- stable parafoveal fixation

Question 5

Microtropia without identity

Answer 5

movement on CT
may have:
- central fixation c ARC
- Unharmonious ARC
- Central fixation c NRC, central suppression and periopheral fusion = eccentric panums area
visualscope = unstable