Understanding Three-Piece Mountings
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1. Lenses used in the earliest eyeglasses were primarily:
A. Plus lenses
B. Minus lenses
C. Cylinder lenses
D. All of the above

2. The correct term to use for three-piece eyeglasses is:
A. Mountings
B. Semi-Rimless Mountings
C. Semi-Rigid Mountings
D. Shurset Mountings

3. Why were pince-nez mountings eventually replaced by three-piece eyewear:
A. Pince-nez were too expensive
B. Pince-nez were too fragile
C. Pince-nez were heavy
D. Pince-nez could not keep cylinder lenses in proper
axis alignment

4. What is the PRIMARY reason that choice of lens material is so important with three-piece eyewear:
A. The lenses must be strong enough to absorb all stress
or strain on the eyewear
B. Patients want the latest technology for their lenses
C. The lenses are expensive
D. Patients want the lightest lenses possible

5. Why was CR-39 acceptable for Shurset mountings, but not acceptable for three-piece mountings:
A. Shurset mountings weren't
as expensive as three-piece mountings
B. Shurset mountings had a support bar connecting
temple hinge and bridge to absorb stress and strain
C. People weren't as rough on their glasses when
Shurset mountings were popular
D. Lenses were smaller when Shurset mountings were
popular

6. Which of the following lens materials has the highest index:
A. CR-39
B. Polycarbonate
C. Trivex
D. MR-10

7. What is the BEST way to correct an off-axis lens in a three-piece mounting:
A. Twist the bridge
B. Drill new holes
C. Twist lens with an axis-aligning plier
D. Order a new lens and drill it correctly

8. Which of the following is important when drilling lenses for three-piece mountings:
A. Holes must be precisely positioned
B. Diameter of holes must be exact
C. Angle of the hole must be correct in respect to the
lens surface
D. All of the above

9. What is the purpose of "chamfering" the edges of each hole:
A. To make the glasses more attractive
B. To remove any rough edges around the hole
C. To keep screws from loosening up
D. To keep the lenses in alignment

10. In adjusting three-piece mountings, which is the MOST important consideration:
A. Avoid putting strain or stress on the lenses
B. Avoid twisting the metal parts
C. Avoid getting finger prints on the lenses
D. Avoid bending the endpiece hinges

11. When measuring a three-piece mounting for progressives, what is the BEST thing to do when the fitting cross measurement is below minimum fitting height:
A. Select a larger frame
B. Select a different style of rimless
C. Use a different lens shape with a deeper vertical
measurement

12. Which of the following styles was the first popular rimless mounting:
A. Pince-nez mountings
B. Three-piece mountings
C. Shurset mountings
D. Numont mountings

13. Which of the following lens materials will produce the strongest lenses for three-piece mountings:
A. CR-39
B. Polycarbonate
C. Trivex
D. MR-10 resin

14. The primary factors in the wearing performance of three-piece eyewear are:
A. The design and construction of the mounting hardware
B. The strength and integrity of the lens material
C. The type of metal used in the hardware
D. a) and b)

15. What's the BEST way to avoid problems when strong minus lenses are used in a three-piece mountings with a fixed pin length:
A. Counter-sink the holes
B. Let the lab mount the lenses
C. Drill larger holes
D. Order the lenses made in 1.67 high index MR-10