CPOA Clinical Procedures 2

Question 1

When performing keratometry, which measurement is recorded?

Accepted Answer

Corneal curvature

Answer

Keratometry measures the curvature of the anterior corneal surface, expressed in millimeters or diopters.

Question 2

A patient's visual acuity is recorded as 20/40. This means the patient sees at 20 feet what a person with normal vision sees at:

Accepted Answer

40 feet

Answer

The denominator in Snellen notation indicates the distance at which a person with normal vision can read the same line.

Question 3

Which instrument is used to measure intraocular pressure by applanation?

Accepted Answer

Goldmann tonometer

Answer

The Goldmann applanation tonometer is the gold standard for measuring IOP by flattening a fixed area of the cornea.

Question 4

During lensometry, the optician neutralizes the lens power by aligning which targets?

Accepted Answer

Sphere crosses and cylinder lines

Answer

In manual lensometry, the sphere is neutralized when the sphere crosses are clear, and cylinder is neutralized when the cylinder lines are clear.

Question 5

What is the purpose of instilling a topical anesthetic before Goldmann tonometry?

Accepted Answer

To reduce patient discomfort and prevent blinking

Answer

Topical anesthetics numb the cornea so the patient tolerates contact from the tonometer tip without reflexive blinking.

(CPOA) Certified Paraoptometric Assistant Practice Test