Modified Thorington and Maddox Rod

Question 1

What are the dissociated phoria tests?

Answer 1

Cover test
Modified Thorington
Maddox Rod
Von Greafe Phorias

Question 2

Which phoria test is objective?

Answer 2

Cover test

Question 3

Which phoria tests are subjective?

Answer 3

Maddox rod

Modified Thorington

Question 4

With the Maddox rod, the patient sees the red line nasally. What deviation is present?

Answer 4

Exo

Question 5

With the Maddox rod, the patient sees the red line laterally. What deviation is present?

Answer 5

Eso

Question 6

Modified Thorington measures lateral and vertical phoria at what distance?

Answer 6

Near

Question 7

How is the ACA ratio calculated?

Answer 7

ACA=PD(cm) + Near fixation distance(m) (near phoria- far phoria)

Question 8

What is the expected ACA ratio?

Answer 8

4:1

Question 9

If the ACA ratio is high with esophoria, what treatment would the patient respond well to?

Answer 9

Plus lenses

Question 10

If the ACA ratio is low with esophoria, what treatment would the patient respond well to?

Answer 10

Prisms and or VT