ABO NOCE Basic Opticianry Spectacle Dispensing Procedures Questions and Answers 3 — Questions and Answers
Question 1: A patient's spectacles show a lateral tilt (one side higher than the other when placed on a flat surface). This is corrected by:
- Adjusting the pantoscopic tilt
- Bending one temple at the skull bend
- Aligning the X-ing of the frame (Correct answer)
- Adjusting the nose pad splay
Correct answer: Aligning the X-ing of the frame
X-ing (twisting) the frame front corrects lateral tilt by counteracting the warp causing one side to sit higher.
Question 2: Which material requires a warm water bath or frame heater before adjustment to prevent breakage?
- Titanium
- Zyl (cellulose acetate) (Correct answer)
- Stainless steel
- Beta-titanium
Correct answer: Zyl (cellulose acetate)
Zyl (cellulose acetate) must be heated before adjustment because it becomes brittle when cold and will crack if bent without warming.
Question 3: When measuring a patient's PD for single vision lenses, the corneal reflex method uses a penlight held at which position?
- Below the patient's line of sight
- At arm's length to the side
- At the patient's nose bridge level
- Directly in front of the examiner's dominant eye (Correct answer)
Correct answer: Directly in front of the examiner's dominant eye
Holding the penlight in front of the examiner's dominant eye ensures the light reflection aligns with the examiner's line of sight for accurate PD measurement.
Question 4: A wrap-style frame has a face form angle of 20°. If no compensatory adjustments are made to the prescription, what effect will this have?
- Induced base-up prism
- Induced base-in prism (Correct answer)
- Induced base-down prism
- Induced base-out prism
Correct answer: Induced base-in prism
Excessive face form (wrap) without compensation induces unwanted base-in prism as the lens nasal edge tilts away from the eye.
Question 5: What is the purpose of the 'four-point touch' test when dispensing spectacles?
- To verify optical center alignment
- To ensure the frame contacts the face at four even points (Correct answer)
- To check temple spring tension
- To measure vertex distance at four points
Correct answer: To ensure the frame contacts the face at four even points
The four-point touch test verifies the frame rests evenly at both nose pads and both temples, ensuring proper fit and stability.
Question 6: A patient requires a high plus prescription. To minimize magnification and improve cosmetics, the optician should recommend:
- Large frame with high index material
- Small frame with aspheric high index lens (Correct answer)
- Standard index CR-39 in any frame
- Large frame with polycarbonate
Correct answer: Small frame with aspheric high index lens
A small frame with aspheric high index lenses reduces center thickness and minimizes the magnification commonly seen with high plus prescriptions.
Question 7: The term 'seg height' in bifocal dispensing refers to:
- The vertical size of the bifocal segment
- The distance from the bottom of the lens to the top of the bifocal segment (Correct answer)
- The optical center height of the distance portion
- The distance from pupil to top of the bifocal segment
Correct answer: The distance from the bottom of the lens to the top of the bifocal segment
Seg height is measured from the bottom of the finished lens to the top of the bifocal segment, placing the reading zone at the correct position.
ABO NOCE Basic Opticianry Spectacle Dispensing Procedures Questions and Answers 3
A patient's spectacles show a lateral tilt (one side higher than the other when placed on a flat surface).
This is corrected by: