COA Ophthalmic Instruments and Procedures 3

Question 1

When performing keratometry, what information is obtained?

Accepted Answer

Anterior corneal curvature in the principal meridians

Answer

Keratometry measures the radius of curvature of the anterior cornea in the flattest and steepest meridians.

Question 2

The Amsler grid is specifically used to detect abnormalities in:

Accepted Answer

Central macular function

Answer

The Amsler grid detects metamorphopsia and central scotomas within the central 20 degrees of the visual field.

Question 3

What is the primary diagnostic purpose of fluorescein angiography?

Accepted Answer

Evaluate retinal and choroidal circulation

Answer

Fluorescein angiography documents retinal and choroidal blood flow by imaging intravenous fluorescent dye.

Question 4

Which device is used to calculate intraocular lens power before cataract surgery?

Accepted Answer

Optical biometry device (e.g., IOL Master)

Answer

Optical biometry devices measure axial length and corneal curvature to calculate the appropriate IOL power.

Question 5

Compared to indirect ophthalmoscopy, the direct ophthalmoscope provides:

Accepted Answer

Higher magnification of a small fundus area

Answer

The direct ophthalmoscope provides approximately 15× magnification but only a small field of the fundus.

COA - Certified Ophthalmic Assistant Practice Test