ABO Binocular Vision & Strabismus

Question 1

The Hirschberg corneal light reflex test is primarily used to estimate the angle of which condition?

Accepted Answer

Strabismus

Answer

Amblyopia

Answer

Myopia

Answer

Presbyopia

Question 2

In esotropia, the deviating eye turns in which direction?

Accepted Answer

Inward (nasal)

Answer

Outward (temporal)

Answer

Upward (superior)

Answer

Downward (inferior)

Question 3

Which term describes a latent ocular deviation that is controlled by fusion and only becomes manifest when fusion is disrupted?

Accepted Answer

Phoria

Answer

Tropia

Answer

Amblyopia

Answer

Diplopia

Question 4

The cover-uncover test is the most reliable clinical method to distinguish between a tropia and a phoria because it:

Accepted Answer

Disrupts fusion, revealing any manifest deviation in the covered eye

Answer

Measures stereoacuity directly

Answer

Assesses the AC/A ratio

Answer

Tests for suppression scotoma

Question 5

A positive result on the Randot Stereotest indicates:

Accepted Answer

Bifoveal fixation and intact binocular vision

Answer

Monocular suppression of one eye

Answer

A manifest strabismus

Answer

Reduced contrast sensitivity

Question 6

The angle kappa is defined as the angle between the:

Accepted Answer

Pupillary axis and the visual axis

Answer

Visual axis and the optical axis of the eye

Answer

Line of sight and the optical axis

Answer

Corneal reflex and the center of the pupil

Question 7

The prism adaptation test (PAT) is used preoperatively in strabismus patients primarily to:

Accepted Answer

Reveal the full angle of deviation before surgery

Answer

Measure the amplitude of accommodation

Answer

Assess contrast sensitivity

Answer

Determine the near point of convergence