D: Aust. Standards - Week 9 Flashcards
How many experts (technical, business, academia, govt, and community experts) create standards?
It’s over 9000!
What is the most important australian standards guide for us to remember?
AS/NZS ISO 21987: 2011 Ophthalmic Optics - Mounted Lens
Name 5 aspects of mounted lenses that need to conform to Australian standards
- Optical: power, axis, prism, near addition
- Thickness and positioning
- Material and surface quality
- Markings
- Special requirements: tings, coatings, photochromatic materials etc.
Name 5 ways the material and surface quality of a mounted lens needs to conform to Australian standards
- Must have no visible defects internally or on the finished surface in the central zone
- Must have a smooth regular bevel and safety chamfer; and no chips or cracks
- No gaps should be present between the frame and lenses
- Lenses should match in shape, size and appearance (tint, ARC, mirror)
- Mounted lenses should be secured in position but not under excessive strain: no “warping” (surface astig over 1D)
What is a safety chamfer?
It’s basically when you smooth off all the edges
How big are the central zones for the following frames?:
A: SVs
B: Bifocal/Trifocal
C: PALs
All are 30m
Where are the central zones centred for bifocals/trifocals?
- around DRP (distance reference point) OR, if segment less than 30mm
- either whole segment or NRP
Between the higher absolute back vertex powers of 0-3 diopters: What is the tolerance for SVs/Multi?
A: The back vertex power of each principle meridian?
B: Cyl power between >0 and <0.75D
C: Cyl power between >0.75D and <4D
D: Cyl power between 4D and 6D
E: Cyl power over 6D
A: 0.12 B: 0.09 C: 0.12 D: 0.18 E: ---
Between the higher absolute back vertex powers of 3-6 diopters: What is the tolerance for SVs/Multi?
A: The back vertex power of each principle meridian?
B: Cyl power between >0 and <0.75D
C: Cyl power between >0.75D and <4D
D: Cyl power between 4D and 6D
E: Cyl power over 6D
A: 0.12 B: 0.12 C: 0.12 D: 0.18 E: 0.25
Between the higher absolute back vertex powers of 6-9 diopters: What is the tolerance for SVs/Multi?
A: The back vertex power of each principle meridian?
B: Cyl power between >0 and <0.75D
C: Cyl power between >0.75D and <4D
D: Cyl power between 4D and 6D
E: Cyl power over 6D
A: 0.12 B: 0.12 C: 0.18 D: 0.18 E: 0.25
Between the higher absolute back vertex powers of 9-12 diopters: What is the tolerance for SVs/Multi?
A: The back vertex power of each principle meridian?
B: Cyl power between >0 and <0.75D
C: Cyl power between >0.75D and <4D
D: Cyl power between 4D and 6D
E: Cyl power over 6D
A: 0.18 B: 0.12 C: 0.18 D: 0.25 E: 0.25
Between the higher absolute back vertex powers of 12-20 diopters: What is the tolerance for SVs/Multis?
A: The back vertex power of each principle meridian?
B: Cyl power between >0 and <0.75D
C: Cyl power between >0.75D and <4D
D: Cyl power between 4D and 6D
E: Cyl power over 6D
A: 0.25 B: 0.18 C: 0.25 D: 0.25 E: 0.25
Between the higher absolute back vertex powers of over 20 diopters: What is the tolerance for SVs/Multis?
A: The back vertex power of each principle meridian?
B: Cyl power between >0 and <0.75D
C: Cyl power between >0.75D and <4D
D: Cyl power between 4D and 6D
E: Cyl power over 6D
A: 0.37 B: 0.25 C: 0.25 D: 0.37 E: 0.37
Between the higher absolute back vertex powers of 0-3 diopters: What is the tolerance for PALs?
A: The back vertex power of each principle meridian?
B: Cyl power between >0 and <0.75D
C: Cyl power between >0.75D and <4D
D: Cyl power between 4D and 6D
E: Cyl power over 6D
A: 0.12 B: 0.12 C: 0.18 D: 0.18 E: 0.25
Between the higher absolute back vertex powers of 3-6diopters: What is the tolerance for PALs?
A: The back vertex power of each principle meridian?
B: Cyl power between >0 and <0.75D
C: Cyl power between >0.75D and <4D
D: Cyl power between 4D and 6D
E: Cyl power over 6D
A: 0.18 B: 0.18 C: 0.18 D: 0.18 E: 0.25