OPTICIAN Flashcards
1
Q
Frame Materials: Metal
A
- Beta Titanium: Alloy, predominantly titanium + small amounts of aluminum & vanadium
- Other metals in the alloy makes it more flexible than 100% titanium for easier fitting adjustments - Memory Metal: Titanium alloy, roughly 50% titanium + 50% nickel
- Extremely flexible, can be twisted or bended to an extreme and still return to original shape
- Great for kids or anyone who is hard on their glasses - Beryllium: Lower-cost alternative to titanium, resists corrosion & tarnishing
- Excellent choice for: high skin acidity / spends a good amount of time in or around salt water
- Lightweight, strong, flexible
- Available in a wide range of colours - Stainless Steel: Iron-carbon alloy + chromium
- Lightweight, strong, durable, flexible & corrosion-resistant
- Matte or polished finishes - Monel: Alloy of nickel & copper
- Popular, inexpensive - less costly than other metals
- Depending on quality of plating: may or may not discolor and cause skin reactions over time
2
Q
Frame Materials: Plastic
A
- Zyl: Also called Zylonite or Cellulose Acetate
- Lightweight & relatively inexpensive type of plastic
- Most popular plastic used for eyeglass frames
- Available in a wide variety of colors, multi-coloured, and with different layers of colour - Propionate: Nylon-based plastic
- Strong, flexible, lightweight & hypoallergenic
- Often used in sports frames bec of durability - Nylon: Still occasionally used
- Strong, lightweight & flexible
- Can become brittle with age
- For the most part been replaced by nylon blends: polyamides, copolyamides, and gliamides – more durable
3
Q
Full Spectrum Lens
A
Ophthalmic lens made from a plastic that transmits approximately 90% of ultraviolet light, whereas a conventional plastic transmits only 10%
