Ophthalmic Frame Materials and Design Flashcards
Which type of temple curves around the ear following the crotch of the ear where the ear and head meet, extending to the level of the earlobe?
Riding bow temple
Which frame material can be made thin and lightweight, with frame colors that are primarily opaque? Some problems may be encountered with breakage in cold weather.
Carbon Fiber
Which frame bridge follows the bridge of the nose smoothly, spreading the weight of the frame over the nose and using nose pads attached to the back of the frame bridge?
Modified Saddle
True or false: a patient’s bridge supports 50% of the weight of the frame.
False - the bridge supports 90% of the weight.
What are the parts of the frame that are the outer areas of the front to the right and left where the temples are attached?
End pieces
What is the name of the bridge that was originally made popular in the late 1800s and is being brought back in several new retro styles?
Metal saddle bridge
What is the butt end of the frame?
The end of the temple that touches against (butts into) the frame front
Which type of frame has two holes on either side of each lens eyewire and a metal reinforcing arm that follows the upper front surface of the lens?
Semi-rimless
The name Zyl or Zylonite is a trade name for which plastic material?
Cellulose Acetate
Which frame material is often used for temples because of its strength and flexibility?
Stainless Steel
When were lenses first set in frames?
Late in the 13th century
Who were the first spectacle frame makers?
Goldsmiths
Which of the following frame materials was not used until the 20th century? Gold, stainless steel, silver, bronze
Stainless Steel
Why did the FDA ban cellulose nitrate as a frame material?
It was too flammable to be considered safe
Why is plastic a popular material for spectacle frames?
It can be easily molded and shaped
What special care is required for nylon frames?
Periodic soaking in water overnight
What plastic frames material is the only one that can be either pantographed or injection molded?
Cellulose Acetate
Which of the following plastics will shrink if overheated? Polyamide, Carbon, Kevlar, Optyl
Polyamide
Because this material is black in its original form, this plastic must apply color through the use of baked-on enameling.
Carbon
In which of the following materials are adjustments the most difficult to achieve due to its tendency to relax? Cellulose acetate, Kevlar, propionate, polyamide
Kevlar
Which of the following materials recommends cold snap lens insertion? Optyl, cellulose acetate, propionate, polyamide
Polyamide
Because of its tendency to dry out, the manufacturers of this frame material recommend that the wearer periodically soak their frames in water overnight.
Nylon
Name the three basic parts of the spectacle frames.
Fronts, temples, and hinges
What ANSI standard regulates safety eyewear?
Z87.1 - 2003
Half eyes are designed for what purpose?
Near only
Which type of mounting has the top part of the lens fitted into the frame while the lens is grooved around the edge and a cord fitted into this groove to hold the lens in place?
Nylon suspension rimless
What is meant by a 2/1 hinge?
Has two barrels on front and one barrel on temple
What kind of hinge is a 2/1 hinge?
3-barrel hinge
The points of attachment of drilled rimless frames are called the _______ areas.
Strap
Describe the method by which tension mountings secure the lenses in place.
Lenses are held in place with clips attached to a top bar. These bars fit into slots on the nasal and temporal edges of the lenses.
What style of frames are not frames at all but rather mountings?
Zyl rims
In a regular rimless mounting, what is the relationship of the points of attachment to each other?
All points of attachment are on the same horizontal plane.
What is the difference between regular and fulvue rimless mountings?
In a fulvue rimless mounting, temporal points of attachment are in a higher horizontal plane.
What is the difference between rimless and nylon rimless frames?
The normal nylon rimless lens is grooved all the way around. The frame also has a groove, but the frame groove is filled with a Fig. 8 liner to hold the grooved lens.
US Customs regulations require that ophthalmic frames, if gold, be marked with what?
The country of origin, its karat content or the method by which the precious metal was applied.
What style temple would be recommended for a ten-year-old boy?
Riding Bow
What is a good general use style of temple that distributes weight over a large area?
Library
What is the measurement is designated by the datum line?
Length of the lens at the 180 line
Name two reference points from which seg height is measured.
Datum line or the lowest point in B box
If a temple was marked 4 3/4-6, what is its overall length?
6 inches
What is the definition of fine gold?
100% pure gold
