Vision and Ophthalmology Diagnostic Testing and Equipment

Question 1

Optical coherence tomography (OCT) uses which type of light to generate cross-sectional retinal images?

Accepted Answer

Near-infrared light

Answer

OCT uses near-infrared light interferometry to generate high-resolution cross-sectional images of retinal layers with micrometer-level resolution.

Question 2

The Goldmann applanation tonometer measures IOP by:

Accepted Answer

Flattening a known area of the cornea (3.06 mm diameter)

Answer

Goldmann applanation tonometry measures the force required to flatten a standardized area (3.06 mm diameter) of the cornea, which correlates with IOP by the Imbert-Fick principle.

Question 3

Fluorescein angiography (FA) is primarily used to evaluate:

Accepted Answer

Retinal and choroidal vasculature

Answer

Fluorescein angiography involves IV injection of fluorescein dye to visualize retinal and choroidal circulation, detecting leakage, blockage, and neovascularization.

Question 4

Which visual field defect is associated with a pituitary adenoma compressing the optic chiasm?

Accepted Answer

Bitemporal hemianopia

Answer

Pituitary adenomas compress the crossing nasal fibers at the optic chiasm, causing bitemporal hemianopia (loss of both temporal fields).

Question 5

A-scan ultrasonography in ophthalmology is primarily used for:

Accepted Answer

Measuring axial length for IOL calculations

Answer

A-scan ultrasonography measures the axial length of the eye, which is essential for calculating intraocular lens (IOL) power before cataract surgery.

Vision and Ophthalmology Practice Test

Vision and Ophthalmology Practice Test

Vision and Ophthalmology Diagnostic Testing and Equipment