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Contact Lens Fitting & Patient Care Flashcards

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

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  1. What does keratometry (K-readings) measure during a contact lens fitting evaluation?

    Answer: Curvature of the anterior corneal surface

    Keratometry measures the radius of curvature of the central anterior corneal surface in two primary meridians, which is essential for selecting the appropriate contact lens base curve.

  2. In contact lens fitting terminology, what does a 'steep' fit indicate?

    Answer: The lens base curve is more curved than the corneal curvature

    A steep fit occurs when the lens base curve is more curved than the cornea, resulting in restricted lens movement, central tear pooling, and potential corneal hypoxia.

  3. Which dye, viewed under cobalt blue light, is used to evaluate the tear film pattern beneath RGP contact lenses?

    Answer: Sodium fluorescein

    Sodium fluorescein illuminated with cobalt blue light reveals the fluorescein pattern under RGP lenses, highlighting areas of bearing (dark), alignment (thin green), and clearance (bright green pooling).

  4. What does the acronym 'LARS' stand for in toric soft contact lens fitting?

    Answer: Left Add, Right Subtract

    LARS guides axis adjustment when a toric lens rotates: if the lens rotates to the Left, Add that number of degrees to the axis; if it rotates Right, Subtract.

  5. What is the recommended contact lens movement with each blink during a soft lens fitting assessment?

    Answer: 0.25 to 1.0 mm

    Adequate soft lens movement of 0.25–1.0 mm per blink ensures proper tear exchange under the lens, supporting corneal oxygenation and preventing lens adherence.

  6. What does 'HVID' stand for in the context of contact lens fitting?

    Answer: Horizontal Visible Iris Diameter

    HVID (Horizontal Visible Iris Diameter) measures the width of the visible iris from limbus to limbus and is used to select an appropriate contact lens overall diameter.

  7. What is the purpose of performing an 'over-refraction' during a contact lens fitting?

    Answer: To identify any residual refractive error beyond what the trial lens corrects

    Over-refraction is performed with the trial lens in place to measure any residual refractive error, indicating whether the lens power needs adjustment for optimal visual acuity.