Parts of the frame
This part connects the two eyewires and rests on the nose; examples include saddle and keyhole
What is the Bridge
What is the eyewire?
The portion of the frame front that surrounds and holds the lenses.
How many pieces typically hold a rimless lens together
Three (two endpieces + bridge).
— Most versatile; suits nearly all frame shapes.
What is Oval
Give one characteristic of plastic (zyl) frame material.
Lightweight and available in many colors; can warp with heat
Name two common nose pad attachment styles
Screw-on, push-in (snap-in), slide-on, adhesive stick-on, air cushion (any two).
In a full rim frame, the eyewire forms this shape around the lens
A complete loop
Name two requirements or cautions for lenses used in rimless (drill mount) frames
Use drill-mount–safe materials; ensure accurate hole placement and proper pilot/drill size.
Angular or rectangular frames add definition to this face shape
What is Round
Name two metals commonly used for eyeglass frames.
Stainless steel and titanium (also monel)
Identify three plastic frame materials used in sport or active frames
Nylon (flexible, impact resistant), rubber (grippy, soft), polycarbonate (impact resistant)
Why does the groove inside the eyewire matter for lens installation
The groove secures the lens edge and holds it in place.
Why are stress cracks a particular risk in rimless mounting
Holes misaligned or uneven torque on fasteners concentrate stress and make cracks more likely.
what type of frames are good for heart shapes faces
Bottom-heavy or rimless style
What are three-piece mounts often called, and how are lenses attached in this style?
Rimless (three-piece) mounts; lenses are drilled and mounted with screws.
Explain why hinge type matters for long-term fit and durability (give two reasons)
Hinges affect how much temples can be adjusted and whether temples will loosen/break over time; spring hinges add flexibility and reduce breakage; hinge type affects long-term alignment and comfort
Give two optician-relevant issues that result from an improperly fitted eyewire
Improper fit can cause stress cracks at the lens edge, lens popping, or improper beveling causing gaps or pressure point
Which lens materials are recommended as drill-mount safe (name at least two)
Trivex and polyamide; some polycarbonate variants
these types of frames are good for people who have a diamond shaped face and why
Oval or cat-eye frames highlight cheekbone
Explain one advantage of nylon-based materials for sports frames.
Nylon is flexible and durable, resisting impact—good for sports.
Describe what information an optician needs to check in the endpiece area to ensure proper temple spread and face fit.
Check endpiece angle, length, shape, and how temple attaches; measure temple spread and face width; ensure correct temple pivot and clearance.
Explain how bevel placement relates to the eyewire and lens edge security
Bevel placement ensures the lens edge seats into the groove without excess stress; incorrect bevel may cause looseness or cracking.
Describe the alignment and torque considerations an optician must manage when assembling a rimless frame.
Ensure hole spacing and alignment match hardware, use proper drill bits and templates, tighten screws evenly and to recommended torque; use appropriate washers or bushings to distribute stress.
Describe pantoscopic tilt and explain how it affects how lenses sit relative to the face
Pantoscopic tilt is the forward tilt of the lens bottom toward the face; it affects the effective vertical alignment and how the optical axis meets the eye, altering optics and comfort
Compare metal and plastic frames in terms of heat sensitivity and typical rigidity (two brief points)
Metal: more heat-resistant and often more rigid (depends on alloy); Plastic: lighter and more colorful but can warp with heat.