Dispensing Instrumentation Flashcards
7 cards from real ABO NOCE Basic Opticianry 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 Instrumentation flashcards as text
An optician uses a digital caliper during the dispensing process primarily to:
Answer: Precisely measure lens thickness, frame dimensions, or segment heights in millimeters
Digital calipers provide precise millimeter measurements of lens thickness, frame component dimensions, and other critical physical parameters during dispensing.
When using a hand-held magnifier or loupe during frame inspection, an optician is most likely looking for:
Answer: Surface defects, scratches, or coating imperfections on the lens
A loupe or magnifier is used to closely inspect lens surfaces for scratches, coating defects, inclusions, or other quality issues before dispensing.
The primary purpose of a lens clock (Geneva gauge) in dispensing is to:
Answer: Measure the sagittal curve (base or front curve) of a lens surface
The lens clock measures the sagittal depth of a lens surface to determine its curvature (base curve), which is useful for matching replacement lenses.
An optician uses a protractor or angle gauge during frame adjustment to measure:
Answer: Pantoscopic tilt and face form (wrap) angle of the frame
A protractor or angle gauge measures pantoscopic tilt (vertical frame angle) and face form wrap angle to ensure proper optical alignment.
When verifying a plano lens on a lensometer, the mires should appear:
Answer: Clear and focused at zero power with no cylinder
A plano lens has no refractive power, so the lensometer mires should focus clearly at zero on the power drum with no cylinder present.
Which instrument measures the near interpupillary distance (near PD) by accounting for the convergence of the eyes at a close working distance?
Answer: A pupillometer set to near mode or a near PD ruler with vergence compensation
A pupillometer in near-mode or a calibrated near PD card accounts for the convergence of the eyes at near working distance, typically 40 cm.
A screwdriver used in optical frame repair should have which tip to avoid stripping tiny eyeglass screws?
Answer: A precision flat-blade or JIS tip sized specifically for optical screws
Optical screws are very small and require precision flat-blade or JIS screwdrivers matched to the screw head size to avoid stripping.