COA Ophthalmic Instruments and Procedures

Question 1

What instrument is used to measure the curvature of the anterior corneal surface?

Accepted Answer

Keratometer

Answer

A keratometer measures the curvature of the anterior corneal surface in two principal meridians.

Question 2

The slit lamp biomicroscope is primarily used to examine which ocular structures?

Accepted Answer

Anterior and posterior segments of the eye

Answer

The slit lamp provides magnified illuminated examination of both anterior and posterior eye segments.

Question 3

What is the primary purpose of performing retinoscopy?

Accepted Answer

Determine refractive error objectively

Answer

Retinoscopy is an objective technique to determine a patient's refractive error by observing the light reflex.

Question 4

Which instrument provides a wide-field inverted view of the fundus?

Accepted Answer

Binocular indirect ophthalmoscope

Answer

The binocular indirect ophthalmoscope provides a wide-field stereoscopic view of the fundus using a condensing lens.

Question 5

A lensometer (lensmeter) is used to measure which of the following?

Accepted Answer

Prescription power of spectacle lenses

Answer

A lensometer measures the sphere, cylinder, axis, and prism of an existing spectacle lens.

COA - Certified Ophthalmic Assistant Practice Test