NOCE Contact Lens Fitting and Care 2 — Questions and Answers
Question 1: Which solution type is contraindicated for use with hydrogen peroxide contact lens disinfection systems during the neutralization step?
- Saline
- Multi-purpose solution (Correct answer)
- Enzymatic cleaner
- Rewetting drops
Correct answer: Multi-purpose solution
Multi-purpose solutions must not be used to neutralize hydrogen peroxide systems; the dedicated neutralizing disk or tablet must be used to avoid ocular damage.
Question 2: A soft toric contact lens rotates 15 degrees counterclockwise on the eye. If the prescription calls for 180-degree cylinder axis, what axis should be ordered?
- 165 degrees (Correct answer)
- 195 degrees
- 180 degrees
- 15 degrees
Correct answer: 165 degrees
Using the LARS rule (Left Add, Right Subtract), a counterclockwise rotation means you subtract 15 degrees: 180 − 15 = 165 degrees.
Question 3: Which condition is an absolute contraindication to contact lens wear?
- Active bacterial keratitis (Correct answer)
- Mild myopia
- Presbyopia
- Low astigmatism
Correct answer: Active bacterial keratitis
Active corneal infection such as bacterial keratitis is an absolute contraindication because contact lens wear would worsen the infection and delay healing.
Question 4: What is the recommended maximum replacement interval for rigid gas permeable (RGP) contact lenses?
- 1–2 years (Correct answer)
- 1 month
- 6 months
- 2 weeks
Correct answer: 1–2 years
RGP lenses are typically replaced every 1–2 years, though this depends on lens deposits, surface degradation, and prescription changes.
Question 5: A patient reports their daily wear soft contact lenses feel dry and uncomfortable by midday. Which product is most appropriate to recommend for in-eye use?
- Rewetting drops formulated for contact lenses (Correct answer)
- Artificial tears with preservatives
- Hydrogen peroxide solution
- Saline nasal spray
Correct answer: Rewetting drops formulated for contact lenses
Rewetting drops designed for contact lens wear are safe for in-eye use and help rehydrate the lens surface without disrupting the tear film.
Question 6: When assessing the fit of a soft contact lens using a slit lamp, a well-fitting lens should demonstrate how much movement on a blink?
- 0.25–0.50 mm (Correct answer)
- Less than 0.10 mm
- 1.00–2.00 mm
- More than 3.00 mm
Correct answer: 0.25–0.50 mm
A properly fitting soft contact lens should move approximately 0.25–0.50 mm with each blink to ensure adequate tear exchange and corneal oxygenation.
NOCE Contact Lens Fitting and Care 2
Which solution type is contraindicated for use with hydrogen peroxide contact lens disinfection systems during the neutralization step?