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Ophthalmic Products and Materials Flashcards

7 cards from real NOCE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Ophthalmic Products and Materials flashcards as text

  1. Which coating type reduces internal lens reflections visible to others looking at the wearer's eyes?

    Answer: Anti-reflective coating

    Anti-reflective coatings reduce reflections on both lens surfaces, making lenses more cosmetically transparent so others can see the wearer's eyes clearly.

  2. A patient's polycarbonate lenses show crazing (fine surface cracks). The MOST likely cause is:

    Answer: Contact with solvents or chemical cleaners

    Polycarbonate is sensitive to many solvents and harsh chemical cleaners, which cause stress crazing — a network of fine surface cracks.

  3. What is the main function of a hydrophobic coating on an ophthalmic lens?

    Answer: Repels water and reduces smudging

    Hydrophobic (water-repelling) coatings cause water to bead and roll off the lens surface, reducing smearing from rain, sweat, and fingerprints.

  4. The base curve of an ophthalmic lens is BEST described as:

    Answer: The curvature of the front surface measured in diopters

    The base curve refers to the front surface curve of the lens, expressed in diopters, which helps maintain proper optical performance and cosmetic appearance.

  5. Which sunglass lens tint color is generally BEST for enhancing contrast in low-light or overcast conditions?

    Answer: Yellow/amber

    Yellow and amber tints filter short-wavelength blue light and enhance contrast, making them ideal for low-light conditions like overcast days or dawn/dusk driving.

  6. When selecting a frame for a high minus prescription, which frame characteristic MOST reduces lens edge thickness?

    Answer: Small, round frame eye size

    Minus lenses are thickest at the edges; choosing a small, round frame minimizes the lens diameter and therefore reduces edge thickness significantly.

  7. A mirror coating on a sunglass lens works primarily by:

    Answer: Reflecting a portion of incoming light off the front lens surface

    Mirror coatings are metallic vacuum-deposited layers on the front surface that reflect a percentage of incoming light, reducing the total light transmission into the eye.