NOCE Dispensing and Fitting Procedures 2 — Questions and Answers
Question 1: A patient's glasses slide down the nose constantly. Which adjustment is MOST appropriate?
- Tighten the temples at the hinge
- Increase the pantoscopic tilt
- Add nose pad armature tension or adjust pad angle (Correct answer)
- Decrease the vertex distance
Correct answer: Add nose pad armature tension or adjust pad angle
Adjusting nose pad tension or angle increases friction and grip to prevent the frame from sliding down.
Question 2: Which fitting measurement determines the height at which the progressive addition lens corridor should be placed?
- Monocular PD
- Segment height (fitting height) (Correct answer)
- Vertex distance
- Pantoscopic tilt angle
Correct answer: Segment height (fitting height)
The segment (fitting) height marks the position of the pupil center relative to the frame bottom to align the progressive corridor correctly.
Question 3: When dispensing a frame with a high base curve, which optical effect is most important to consider?
- Increased chromatic aberration
- Reduced magnification
- Induced prism at the optical center
- Wrap-induced oblique astigmatism (Correct answer)
Correct answer: Wrap-induced oblique astigmatism
High base curve wrap frames introduce oblique astigmatism when the lens plane is not perpendicular to the line of sight.
Question 4: A patient complains of facial pressure behind the ears after wearing new glasses for one hour. The FIRST adjustment to check is:
- Pantoscopic tilt
- Temple length and bend position (Correct answer)
- Nose pad width
- Frame front alignment
Correct answer: Temple length and bend position
Discomfort behind the ears is usually caused by temples that are too short or have their bend positioned too far forward.
Question 5: For a patient with a high minus prescription, which lens design choice reduces edge thickness the most?
- Large round frame with low-index lens
- Small frame with high-index lens (Correct answer)
- Large rectangular frame with polycarbonate
- Rimless frame with CR-39
Correct answer: Small frame with high-index lens
A smaller frame minimizes the lens diameter needed, and a higher-index material bends light more efficiently, both reducing edge thickness.
Question 6: What is the purpose of a splay adjustment on metal nose pads?
- To change the pantoscopic tilt of the frame
- To move the frame higher or lower on the nose
- To widen or narrow the distance between the pads (Correct answer)
- To adjust the vertex distance
Correct answer: To widen or narrow the distance between the pads
Splay adjustment moves the nose pads inward or outward to match the width of the patient's nasal bridge.
Question 7: A dispensing optician verifies a finished lens using a lensometer. If the mires appear broken or distorted, this most likely indicates:
- Incorrect axis
- Scratched or defective lens surface (Correct answer)
- Incorrect sphere power
- Prism in the lens
Correct answer: Scratched or defective lens surface
Broken or distorted mires in the lensometer indicate surface irregularities such as scratches, warpage, or coating defects.
NOCE Dispensing and Fitting Procedures 2
A patient's glasses slide down the nose constantly.
Which adjustment is MOST appropriate?