ABO NOCE Basic Opticianry Spectacle Dispensing Procedures Questions and Answers 4 — Questions and Answers
Question 1: Which adjustment increases the pantoscopic tilt of a metal frame?
- Bending the temples upward at the skull
- Bending the endpiece to angle the frame top away from the face
- Closing the nose pads
- Bending the endpiece to angle the frame bottom away from the face (Correct answer)
Correct answer: Bending the endpiece to angle the frame bottom away from the face
Bending the endpiece so the bottom of the frame tilts away from the face increases pantoscopic tilt, angling the top of the frame closer to the brow.
Question 2: When ordering lenses for a rimless mounting, which measurement is MOST critical to provide accurately?
- Frame PD
- Exact lens shape and drill hole placement (Correct answer)
- Bridge width
- Temple length
Correct answer: Exact lens shape and drill hole placement
In rimless mountings, the precise lens shape and drill hole placement are critical because errors cannot be corrected by the frame rim as in full-rim designs.
Question 3: A patient's progressive lenses show 'swim' (image movement) during lateral gaze. This symptom is MOST commonly associated with:
- Incorrect seg height
- Incorrect PD causing improper fitting point alignment (Correct answer)
- Too much pantoscopic tilt
- Incorrect vertex distance
Correct answer: Incorrect PD causing improper fitting point alignment
Swim in progressive lenses is frequently caused by incorrect PD, which misaligns the fitting cross and distortion zones relative to the patient's pupils.
Question 4: What does 'effective diameter' (ED) represent in lens ordering?
- The horizontal width of the lens
- The diagonal measurement of the lens shape
- The longest chord through the geometric center of the lens
- The diameter of the smallest circle enclosing the entire lens shape (Correct answer)
Correct answer: The diameter of the smallest circle enclosing the entire lens shape
Effective diameter is the diameter of the smallest circle that can fully enclose the lens shape, used to determine minimum blank size needed.
Question 5: A patient with a monocular PD of 35 mm OD and 33 mm OS has their segments decentered. Which eye's segment should be positioned further nasally?
- OD, because the PD is larger
- OS, because the PD is smaller (Correct answer)
- Both segments are placed symmetrically
- Neither — seg position is unrelated to PD
Correct answer: OS, because the PD is smaller
A smaller monocular PD (OS = 33 mm) means the pupil is closer to the nose, so the segment must be placed further nasally to align with the pupil.
Question 6: When should an optician perform a vertex distance compensation calculation?
- For all prescriptions regardless of power
- When sphere or cylinder power exceeds ±4.00 D (Correct answer)
- Only for bifocal prescriptions
- Only when the frame vertex distance differs by more than 5 mm
Correct answer: When sphere or cylinder power exceeds ±4.00 D
Vertex distance compensation is clinically significant when sphere or cylinder power exceeds ±4.00 D, as smaller powers produce negligible effective power changes.
Question 7: A patient complains their new glasses feel like they are sliding down their nose constantly. After checking the nose pads, the NEXT adjustment to consider is:
- Increasing pantoscopic tilt
- Tightening the skull bend to increase temporal pressure (Correct answer)
- Widening the nose pad spread
- Decreasing the face form angle
Correct answer: Tightening the skull bend to increase temporal pressure
Tightening the skull bend increases the inward pressure of the temples against the head, which helps prevent the frame from sliding forward and down.
ABO NOCE Basic Opticianry Spectacle Dispensing Procedures Questions and Answers 4
Which adjustment increases the pantoscopic tilt of a metal frame?