ABO Binocular Vision & Strabismus 2

Question 1

In a patient with exotropia, the deviating eye turns in which direction?

Accepted Answer

Outward (temporal)

Answer

Inward (nasal)

Answer

Upward (superior)

Answer

Downward (inferior)

Question 2

The Maddox rod test is primarily used to assess:

Accepted Answer

The magnitude and direction of a phoria

Answer

Binocular visual acuity under normal conditions

Answer

Stereoacuity in arc seconds

Answer

Corneal topography

Question 3

Anisometropic amblyopia develops primarily because:

Accepted Answer

A significant refractive difference between the two eyes causes chronic blur in one eye

Answer

A constant unilateral strabismus suppresses one eye

Answer

Congenital media opacity prevents form vision

Answer

Ptosis occludes the visual axis

Question 4

Clinically normal stereoacuity is typically defined as a threshold of:

Accepted Answer

40 arc seconds or better

Answer

100–200 arc seconds

Answer

500 arc seconds

Answer

1,000 arc seconds

Question 5

The Worth 4-Dot test uses red and green filters to evaluate:

Accepted Answer

Suppression and the quality of binocular fusion

Answer

Stereoacuity in arc seconds

Answer

The full refractive error of each eye

Answer

Accommodation amplitude

Question 6

Strabismic amblyopia results from which specific cause?

Accepted Answer

Constant unilateral strabismus causing chronic suppression of the deviating eye

Answer

A large interocular refractive difference

Answer

Congenital cataract obstructing the visual axis

Answer

Uncorrected bilateral high myopia

Question 7

Convergence insufficiency is most characteristically defined by:

Accepted Answer

Exophoria or exotropia that is greater at near than at distance

Answer

A high AC/A ratio with esophoria at near

Answer

Esophoria at distance with orthophoria at near

Answer

Hyperphoria at near fixation