1- Frame Fundamentals Flashcards
What are the 3 main eyewear categories?
Dress Eyewear
Safety Eyewear
Sports Eyewear
What are 5 categories of Lens styles?
Single vision Lenses
Bifocal Lenses
Trifocal Lenses
Progressive Lenses
Office Lenses
Name 3 different kinds of bridges?
Keyhole bridge
Metal Saddle bridge
Comfort bridge
Name 4 names of the area of the temples
Look at diagram
Butt portion/ butt end
Shank/Shaft
Bend
Bent down portion/Endpiece
What are the 5 temple styles + general general description? Look at diagram for visual
Skull - bends behind ear, lift + off
Library - straight back, easy on and off
Convertible - mix of skull + library, can be adjusted to either
Riding Bow - plastic on shank, metal ends
Comfort Cable - all metal
What is the line in the exact halfway point of the box/lens called? 3 different names
Horizontal midline
180 - degree line
Datum line
What is the vertical measurement of the lens?
B measurement
What is DBL?
Distance between lenses / bridge size
What does GC and GCD stand for?
Geometric Centre
Geometric center distance (frame pd)
How do you find the Geometric Center? 3 steps
1- Find the halfway point of the A measurement
2 - Find the halfway point of the B measurement
3 - Find the intersection of the cross drawn after plotting the two crosses.
How do you measure the Effective Diameter?
Measure along the longest radius to the geometric center then times by two.
ED can never be smaller than A ? T/F
True
What is the seg raise/drop?
The amount that the segment is lowered or raised from the datum line.
What is the segment height?
This is the distance from the lowest point of the frame to the top of the segment.
What is the seg inset?
How much the lens has been decentered to Aline with the patients interpupillary distance.
