24 - Best Practices of Handling Glasses Flashcards
What advice should you give pxs when taking glasses off?
Take off with two hands
Review steps for taking glasses off with right and left hands only
Glasses should be placed lenses down. T/F
False
Where should glasses always be kept when not being worn?
Case
Should you leave glasses in car?
Do not leave them in car where they are exposed to cold/hot
What should you do when cleaning glasses? 2
-Rinse lenses before wiping them with a micro-fibre cloth
-Frames need cleaning to
What can acetone do/help with lenses? 2
-Do not use acetone on polycarbonate frames
-Difficult - to - remove lens spots were taken care of using acetone
How do we clean a lens with an AR coating? 4 steps
1) Rinse the lenses with lukewarm water
2) Clean using mild dishwashing liquid or hand soap (no hand cream) Rub soap on both sides for 5 seconds
3) Rinse the soap off with tap water
4)Dry with a soft, clean cloth, such as a cotton towel
5 Characteristics of Crown Glass Lenses
- Resists scratching
-not easily affected by environmental factors
-refractive index - 1.523
-low chromatic aberration
-abbe value - 58
What is disadvantage of crown glass? 2
heavy
not impact resistant
4 Characteristics of High-Index Glass
-Index 1.6 - spherical/aspheric designs/segmented bifocals/progressive
-1.90 index - not used often, doesn’t pass FDA standards
-Abbe value similar to polycarb - 30/31
-high index = lighter than crown glass for more than -7D
Does a corning clear 1.6 surfaced with 1.5mm centre thickness, and after hardening, is impact resistant enough to pass FDA standards. T/F
True
What should we consider when looking at a high-index lens? 6
- index of refraction
-weight
-impact resistance
-finished lens thickness
-abbe value - ease of production
3 Characteristics of Polycarbonate
-soft material
-anti-scratch coating
-high-impact resistance
When is safety of an eye of high concern? 5
-children
-monocular individuals
-good VAs in 1 eye only
-safety eyewear
-sports eyewear
