Quiz 5 - Measurements Flashcards
All decentration calculations are referenced from the frame’s
a. GC
b. DBL
c. PRP
d. ED
a. GC
The definition of the Boxing System is
a. A standard method of determining frame and lens measurements
b. The preferred frame packaging method
c. A step in the lens edging procedure
d. A type of generating system
a. A standard method of determining frame and lens measurements
Which of the following is not determined by boxing?
a. Temple length
b. Distance Between Centers
c. “A” Measurement
d. Effective Diameter
a. Temple length
The vertical size measurement is known as
a. ED
b. “A”
c. “B”
d. DBL
c. “B”
Lens thickness is surfaced to which measurement?
a. ED
b. “A”
c. “B”
d. DBL
a. ED
The effective diameter is calculated using which formula?
a. 2 times longest Radius
b. Longest diameter divided by 2
c. A + DBL
d. 2 (A/2)
a. 2 times longest Radius
What tool would be used to measure the base curve of a lens?
a. Lens calipers
b. Geneva Lens Measure (Lens Clock)
c. Sag meter
d. Lensmeter
e. Both b & c
e. Both b & c
The approximate power of a finished lens can be determined by using a lens measure or lens clock.
a. True
b. False
a. True
When allowing for the depth of a “V” bevel of a lens placed in a full eyewire frame, how many mm are adding to each edge side of the lens?
a. .5mm
b. 1.0mm
c. 1.5mm
d. 2.0mm
a. .5mm
How many millimeters equals one inch?
a. 25.4
b. 2.54
c. 100
d. 20.5
a. 25.4
