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The frame front
- endpieces (where temples attach to the frame front)
- butt portion
small wire arm that holds the nose pad in place
Cellulose acetate ("zyl")
makes up majority of plastic frames on the market. Made from cotton linters, some liquid chemicals and plasticizer.
metal frames (monel)
nickel (65%) based metal with copper and iron
disadvantages--plating can wear off--skin allergies, heaviest of metal frame materials
Certified 100% titanium=
at least 90% of frame is titanium with no nickel
Plastic Frame Materials
- Cellulose Nitrate (zylonite)--FLAMMABLE
- Propionate--Lighter weight than zyl
- Optyl--Stronger and lighter than zyl, epoxy resin with thermo-elastic memory, hypoallergenic
- Nylon/Polyamide--lightweight, flexible, durable, translucent, hyperallogenic, chemical resistant
- Carbon Fiber--combined with nylon/thin, light, strong, NOT ADJUSTABLE
- Polycarbonate--sport/safety purposes
- Kevlar--combined with nylon/strong and lightweight, IMPOSSIBLE TO ADJUST
- Rubber--sports eyewear, sunglasses frames, swim goggles
Certified Beta Titanium=
at least 70% titanium and no nickel
metal frame has a solid metal band that surrounds the entire lens. Lens is held in place in a groove in the eyewire, which is tightened around the lens with a screw.
When one lens appears higher than the other
Bench Adjustment order
- Start at bridge and work out towards temples
- look for skewing (horizontal alignment)
- 4-point touch for vertical alignment (face form, x-ing, variant plane)
- temple spread
- temple parallelism--flat surface touch test
- pantoscopic tilt
- temple bend
- temple fold (case angle)
5 steps to evaluate the adjustment
- Temple spread--does your PD ruler fit between the temple and side of patient's head?
- Vertex distance--is it equal? Have pt. look down, view from above
- Pantoscopic Tilt--look at patient's profile
- Level eyewires--is one side higher than the other?
- Temple bend position--look behind ears to evaluate
the vertical position of the pads when viewed from the front (should be ~20 degrees)
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