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NOCE Contact Lens Fitting and Care Flashcards

6 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 6 NOCE Contact Lens Fitting and Care flashcards as text

  1. What does the base curve (BC) of a contact lens refer to?

    Answer: The radius of curvature of the back surface of the lens

    The base curve is the radius of curvature of the posterior (back) surface of a contact lens, typically measured in millimeters.

  2. What does the Dk value of a contact lens material represent?

    Answer: Oxygen permeability of the lens material

    Dk is a measure of oxygen permeability where D is the diffusion coefficient and k is the solubility of oxygen in the lens material.

  3. What is the typical overall diameter range for standard soft contact lenses?

    Answer: 13.8–14.5 mm

    Most soft contact lenses have an overall diameter of 13.8–14.5 mm to ensure proper corneal coverage and limbal overlap.

  4. Which FDA group classification describes soft contact lens materials with HIGH water content and IONIC charge?

    Answer: Group IV

    FDA Group IV contact lens materials are ionic (charged) with high water content (≥50%), making them more susceptible to deposits.

  5. What is the primary function of the pre-lens tear film in contact lens wear?

    Answer: To lubricate the lens surface and maintain optical clarity

    The pre-lens tear film provides lubrication, maintains a smooth optical surface over the contact lens, and supplies nutrients to the cornea.

  6. Daily disposable contact lenses are designed to be worn for what maximum duration before disposal?

    Answer: One full day, then discarded

    Daily disposable lenses are single-use lenses designed to be worn for one day and discarded each evening, eliminating the need for lens care solutions.