AOC AOC Diagnostic Testing and Instrumentation 2

Question 1

Optical coherence tomography (OCT) in the context of neuro-ophthalmic care is most useful for assessing which structure?

Accepted Answer

Retinal nerve fiber layer thickness and optic disc

Answer

OCT measures retinal nerve fiber layer (RNFL) thickness and optic disc morphology, aiding in the diagnosis of glaucoma and optic neuropathies.

Question 2

Forced duction testing during an eye examination is performed to distinguish which two conditions?

Accepted Answer

Mechanical restriction vs. neurogenic paresis of extraocular motility

Answer

Forced duction testing physically moves the eye with instruments; resistance indicates mechanical restriction, while easy movement suggests neurogenic paresis.

Question 3

Which instrument measures the degree of prism-induced deviation needed to neutralize strabismus, forming the basis of the prism cover test?

Accepted Answer

Prism bar or loose prism set

Answer

A prism bar or loose prisms are held before the eye during the cover test; the neutralizing prism power equals the angle of deviation in prism diopters.

Question 4

In the Hess screen test, a contracted field pattern on the affected side indicates which finding?

Accepted Answer

Underacting muscle ipsilateral to the small field

Answer

A small (contracted) field on the Hess screen indicates underaction of the muscles on that side, corresponding to a paresis or restriction.

Question 5

Electro-oculography (EOG) measures which physiological parameter of the eye?

Accepted Answer

Standing potential of the eye (retinal pigment epithelium function)

Answer

EOG records the standing electrical potential between the cornea and retina, reflecting retinal pigment epithelium (RPE) function.

(AOC) American Orthoptic Council Practice Test

(AOC) American Orthoptic Council Practice Test

AOC AOC Diagnostic Testing and Instrumentation 2