NOCE Ophthalmic Products Questions and Answers — Questions and Answers
Question 1: A patient with sensitive eyes who frequently experiences irritation from their soft contact lenses would likely benefit most from switching to which type of cleaning and disinfecting system?
- A multi-purpose solution.
- A saline solution.
- A hydrogen peroxide-based system. (Correct answer)
- A daily cleaner for rigid gas permeable lenses.
Correct answer: A hydrogen peroxide-based system.
Hydrogen peroxide-based systems provide strong disinfection and are typically preservative-free, making them an excellent choice for individuals with sensitivities or allergies to the preservatives found in many multi-purpose solutions. Saline solution only rinses lenses and has no disinfecting properties. RGP solutions are formulated for hard lenses, not soft ones.
Question 2: A patient who is a welder requires new safety glasses. Which frame material would be the most suitable choice due to its high durability, resistance to corrosion, and ability to withstand high temperatures?
- Zyl (Cellulose Acetate)
- Monel
- Nylon
- Beryllium (Correct answer)
Correct answer: Beryllium
Beryllium is a very strong, lightweight, and corrosion-resistant metal that can also withstand high temperatures, making it an excellent choice for demanding environments like welding. Zyl and Nylon are plastics that would not hold up well to the heat and potential sparks of welding. Monel, while a common metal for frames, is not as resistant to corrosion or high heat as beryllium.
Question 3: A presbyopic patient with significant anisometropia complains of double vision and eye strain specifically when reading through their new bifocals. Which of the following specialized lens modifications is designed to correct this issue?
- Anti-reflective coating
- Slab-off (bicentric grinding) (Correct answer)
- Aspheric lens design
- Edge polishing
Correct answer: Slab-off (bicentric grinding)
Slab-off, also known as bicentric grinding, is a technique used to add base-up prism to the reading portion of one lens to correct for vertical imbalance at near. This imbalance is a common problem in anisometropic patients wearing multifocals, leading to symptoms like diplopia and asthenopia when reading.
Question 4: Which of the following is a primary advantage of a digitally surfaced (free-form) progressive lens compared to a traditional, conventionally molded progressive lens?
- Significantly lower cost of manufacturing.
- Wider fields of clear vision and reduced peripheral distortion. (Correct answer)
- Availability in a greater range of tints and colors.
- A universally thicker and heavier lens profile.
Correct answer: Wider fields of clear vision and reduced peripheral distortion.
Digital, or free-form, manufacturing allows for the lens surfaces to be customized point-by-point based on the patient's specific prescription, frame fit, and position of wear. This results in wider, clearer visual zones (distance, intermediate, and near) and significantly reduced peripheral distortion or 'swim' effect compared to traditional one-size-fits-all molded designs.
Question 5: A patient with low vision due to macular degeneration needs a device to help them read their mail and write checks. Which of the following aids would be most effective and practical for these specific tasks?
- A handheld monocular telescope
- Spectacle-mounted magnifiers
- A desktop electronic video magnifier (CCTV) (Correct answer)
- Large-print playing cards
Correct answer: A desktop electronic video magnifier (CCTV)
A desktop electronic video magnifier (CCTV) is ideal for tasks like reading mail and writing checks because it provides significant, adjustable magnification and contrast enhancement. Crucially, it offers a large working distance between the camera and the task, allowing the user to comfortably place items underneath and write, which is difficult with spectacle-mounted or handheld magnifiers. A monocular telescope is for distance viewing, and large-print cards are not applicable to the tasks described.
Question 6: A customer is complaining about distracting reflections on their lenses, especially while driving at night and when using a computer. They also mention that people can't see their eyes well in photos. What lens enhancement should be recommended?
- Photochromic treatment
- Anti-reflective (AR) coating (Correct answer)
- A scratch-resistant coating
- Polarized lenses
Correct answer: Anti-reflective (AR) coating
Anti-reflective (AR) coating is specifically designed to reduce reflections from the front and back surfaces of the lenses. This increases light transmission for clearer vision, reduces glare from headlights and screens, and makes the lenses appear nearly invisible, improving cosmetic appearance.
NOCE Ophthalmic Products Questions and Answers
A patient with sensitive eyes who frequently experiences irritation from their soft contact lenses would likely benefit most from switching to which type of cleaning and disinfecting system?