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Dispensing and Fitting Procedures 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 Dispensing and Fitting Procedures flashcards as text

  1. What is the recommended minimum fitting height for most progressive addition lenses?

    Answer: 18 mm

    Most standard progressive lenses require a minimum fitting height of 18 mm to accommodate the full corridor length and reading zone.

  2. A dispensing optician measures a patient's distance PD as 66 mm and near PD as 62 mm. The difference indicates:

    Answer: Normal convergence of approximately 2 mm per eye at near

    Eyes converge when viewing near objects, so near PD is typically 4–6 mm less than distance PD, representing approximately 2 mm per eye.

  3. When using a frame heater (hot air or salt pan) to adjust a plastic frame, the frame should be:

    Answer: Heated evenly until pliable, then adjusted and held until cooled

    The frame should be heated evenly until the plastic becomes pliable, then adjusted and held in the new position until it cools to retain the shape.

  4. Which verification step checks that prism has not been unintentionally introduced into a finished lens?

    Answer: Locating the optical center with a lensometer and comparing to the expected position

    Locating the optical center with the lensometer confirms it is positioned where specified; a displaced OC introduces unwanted prism.

  5. A patient's new glasses cause a 'floor tilt' perception when walking. This is MOST commonly associated with:

    Answer: Adaptive difficulty with a progressive lens corridor

    The 'swimming' or floor-tilt perception is a classic adaptation symptom for new progressive lens wearers as the brain adjusts to peripheral distortion zones.

  6. According to ANSI Z80.1, what is the maximum allowable horizontal prism imbalance between the two lenses at the distance reference point?

    Answer: 0.67 Δ

    ANSI Z80.1 allows a maximum of 0.67 prism diopters of horizontal imbalance between the two lenses at the distance reference point.

  7. A patient's frame is sitting too low on the face, causing them to look through the top of the progressive reading zone in distance gaze. The BEST adjustment is to:

    Answer: Tighten the nose pads to raise the frame

    Tightening (narrowing) the nose pads raises the frame on the patient's face, restoring proper optical center alignment with the pupil.