FREE National Opticianry Competency Exam (NOCE) Contact Lens Principles Questions and Answers

Question 1

Which of the following contact lens materials is primarily known for its excellent oxygen permeability and rigidity, making it suitable for correcting high astigmatism and irregular corneas?

Accepted Answer

Rigid Gas Permeable (RGP)

Answer

Hydrogel

Answer

Silicone Hydrogel

Answer

Polymethyl Methacrylate (PMMA)

Question 2

An optician is fitting a new soft contact lens for a patient. The base curve (BC) of the lens is measured at 8.6 mm. The patient's K-readings are 43.00 D @ 180 / 43.50 D @ 090. What is the most appropriate initial assessment of the lens fit based on these parameters?

Accepted Answer

The lens will likely fit too loose.

Answer

The lens will likely fit too tight.

Answer

The lens will likely fit appropriately.

Answer

The K-readings are irrelevant for soft lens fitting.

Question 3

Which of the following conditions is a contraindication for successful contact lens wear?

Accepted Answer

Active ocular infection

Answer

Mild myopia

Answer

Presbyopia corrected with monovision

Answer

Stable low astigmatism

Question 4

A patient reports experiencing intermittent blurry vision and a feeling of dryness towards the end of their contact lens wearing day. They currently wear monthly disposable silicone hydrogel lenses. What is the most likely cause of their symptoms?

Accepted Answer

Insufficient lens care and protein buildup.

Answer

Their lenses are too tight.

Answer

Over-refraction is needed.

Answer

Their lenses are too loose.

Question 5

When instructing a patient on proper contact lens care, which of the following is the most critical step to emphasize for preventing serious eye infections?

Accepted Answer

Always wash hands thoroughly with soap and water before handling lenses.

Answer

Always store lenses in an empty case overnight.

Answer

Rinse the lens case weekly with tap water.

Answer

Use saliva to re-wet lenses if they feel dry.

Question 6

Which instrument is used to measure the curvature of the anterior surface of the cornea, providing essential data for contact lens fitting?

Accepted Answer

Keratometer

Answer

Lensometer

Answer

Phoropter

Answer

Ophthalmoscope