CPO Clinical Principles and Procedures

Question 1

Which of the following is used to measure intraocular pressure (IOP)?

Accepted Answer

Tonometer

Answer

A tonometer is the instrument specifically used to measure intraocular pressure (IOP), which is the fluid pressure inside the eye. This measurement is a critical screening tool for detecting and monitoring glaucoma, a condition that can lead to optic nerve damage and vision loss.

Question 2

What is the primary purpose of performing retinoscopy during a patient examination?

Accepted Answer

Determining the refractive error of the eye

Answer

Retinoscopy is an objective method used during an eye examination to determine the refractive error of the eye, meaning whether a person is nearsighted, farsighted, or has astigmatism. By observing the light reflex from the retina, the examiner can accurately estimate the necessary lens prescription without requiring patient feedback, which is especially useful for children or non-verbal individuals.

Question 3

What does a patient’s visual acuity of 20/40 indicate?

Accepted Answer

The patient sees at 20 feet what a normal person sees at 40 feet.

Answer

A visual acuity of 20/40 indicates that the patient sees at 20 feet what a person with normal vision would typically see at 40 feet. This means their vision is less sharp than average, requiring them to be closer to an object to see it as clearly as someone with 20/20 vision would from further away.

Question 4

Which pre-test procedure determines the prescription power of the patient’s glasses?

Accepted Answer

Lensometry

Answer

Lensometry is the pre-test procedure used to measure the prescription power of a patient's existing eyeglasses. This helps the optometrist determine the current correction being worn, which is essential for comparison with new findings and for verifying the accuracy of new lenses.

Question 5

What is the purpose of the cover test in clinical practice?

Accepted Answer

To assess for strabismus or binocular alignment

Answer

The cover test is a crucial clinical procedure used to assess for strabismus (an eye turn) or any subtle misalignment of the eyes. By alternately covering and uncovering each eye, the examiner can observe any movement of the uncovered eye, indicating a deviation in binocular alignment.

(CPO) Certified Paraoptometric Practice Test

(CPO) Certified Paraoptometric Practice Test

CPO Clinical Principles and Procedures