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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. A patient's PD is 63 mm and the frame's distance between lenses (DBL) is 18 mm with each eye size of 50 mm. What is the monocular decentration needed per lens?

    Answer: 1.5 mm per lens

    The geometric center of each lens is at 50/2 + 18/2 = 34 mm from the center; for a 63 mm PD the half-PD is 31.5 mm, giving 34 - 31.5 = 2.5 mm total, or 1.5 mm per lens inward (monocular decentration = (ED/2 + DBL/2) - half-PD = 25+9=34 - 31.5 = 2.5 mm total / this is the binocular decentration; monocular = 1.5 mm inward per lens).

  2. Which instrument is used to locate and mark the optical center of a finished lens before insertion into the frame?

    Answer: Lensometer (focimeter)

    The lensometer identifies and marks the optical center (and other reference points) of a finished ophthalmic lens.

  3. A patient with a prescription of +6.00 DS would benefit most from which type of frame to minimize magnification?

    Answer: Small frame with aspheric high-index lenses

    Aspheric designs flatten lens curves to reduce magnification, and a smaller eye size reduces center thickness in high plus prescriptions.

  4. When verifying a finished bifocal, what is the ANSI Z80.1 tolerance for segment height difference between the two lenses?

    Answer: 1.0 mm

    ANSI Z80.1 permits a maximum of 1.0 mm difference in segment height between the right and left lenses of a finished bifocal.

  5. A child's frame sits very close to the eyelashes, causing lens contact. The BEST adjustment is to:

    Answer: Increase the vertex distance by opening the nose pads outward

    Increasing vertex distance by adjusting nose pads to widen their spread moves the frame away from the face, clearing the eyelashes.

  6. Which of the following BEST defines 'wrap angle' (face form tilt) in frame fitting?

    Answer: The horizontal curvature of the frame front that follows the face

    Wrap angle (face form tilt) is the horizontal curvature of the frame front that allows it to conform to the contour of the patient's face.

  7. A patient reports that text appears to slant to one side through new single-vision lenses. The MOST likely cause is:

    Answer: Cylinder axis error

    An axis error in cylindrical correction causes perceived tilt or distortion of vertical or horizontal lines.