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O Optics B11 > Tints And Coatings > Flashcards

Tints And Coatings Flashcards

1
Q

Coating that repels water, preventing the formation of water spots

A

Hydrophobic coating

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2
Q

Coating that resists smearing from facial or skin oils, smudge resistant. Also called lipophobic

A

Oleophobic coating

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3
Q

Coating that reduces attraction or dust (dust repellent)

A

Anti-static

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4
Q

Coating that eliminates the condensation of moisture on lenses that cause fogging (when coming in from the cold)

A

Anti-fog

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5
Q

Fog free coating that is applied to lenses before they are cut to a frame

A

Opticote

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6
Q

Who would want anti-fog lenses?

A
  • skiers
  • police officers
  • first respondents
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7
Q

A coating applied to a lens that does not interfere with how the lenses function, but creates a permanent bond with the lens that reduces the incidence of the hairline scratches common to plastic
lenses

A

Scratch resistance

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8
Q

What is the different between glass lenses and plastics regarding scratch resistance?

A

Glass lenses are scratch resistant, but plastics are fragile and need scratch resistant coating

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9
Q

Can a coating be applied to a lens to make it scratch proof?

A

No!

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10
Q

When a lens is immersed in a bath of coating solution

A

Dipping

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11
Q

A liquid coating dropped on the center of a surface and rotated rapidly

A

Spin coating

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12
Q

How is scratch resistance applied?

A

Be dipping or spin coating

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13
Q

After coating what must be done to strength en adherence and promote durability?

A
  • baking

- UV curing

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14
Q

A thin layer or series of layers of material applied to the surface of a lens for the purpose of reducing unwanted reflections from the lens surface and thus increasing the amount of light that passes through to the eye

A

Anti-reflective coating

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15
Q

What are 4 benefits of an anti-reflective coating?

A
  • better light transmission
  • better vision in all lighting situations (especially low light)
  • reduces eye strain
  • cosmetic benefits
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16
Q

The higher the index of refraction, the ___ light that will be reflected from the surface

A

More

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17
Q

A/R coatings usually consist of multiple microscopic layers of____

A

Metallic oxides

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18
Q

Why do we use multiple layers for A/R coatings?

A

Because the more layers, the more reflections that are neutralized

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19
Q

Are A/R coating lenses thick or thin? Are they uniform or uninformed?

A

That are microscopically thin and uniform layer

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20
Q

A multilayer A/R coating stack generally is about ___ microns thick

A

0.2-0.3

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21
Q

What 2 faint residual colors are A/R coatings usually?

A

Green or blue

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22
Q

In general, lenses transmit ___ of available light to the eye–> A/R coated lenses can transmit up to ___ of light through the eye

A

General: 85-96%

A/R: 98-99.5%

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23
Q

In what type of lenses do you want to make sure they have an A/R coating?

A
  • polycarbonate
  • high index lenses
  • aspheric lenses
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24
Q

T/F: blue light can be harmful on the eyes

A

True

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25
What eye disease is blue light a risk factor to?
Age-related Macular degeneration
26
T/F: A/R coatings cant filter out harmful blue light
False. They can
27
Used to block UV rays from damaging the eye
UV coating
28
What is considered a good UV coating?
Less that 5% of UV rays pass through the lens (95% blocked)
29
What is considered the best UV coating on a lens?
2% or less of UV rays pass through the lens (98%blocked)
30
What is the wavelength of UVA?
320-400nm
31
What is the wavelength of UVB?
290-320nm
32
What is the wavelength of UVC?
100-290nm
33
What is the worst UV light?
UVC
34
All of the common lens materials absorb what type of UV light?
UVB
35
What 2 lenses absorb all UV radiation?
Polycarbonate and trivex
36
Lenses that darken on exposure to light, most commonly UV radiation
Photochromic lenses
37
formulation of dyes on the surface of the lens that are | made up of molecules that constantly recalibrate as light changes
Transitions Chromea7
38
What 2 ways can transitions chromea7 be added?
- imbibing (uses head to draw dye into lens) | - trans-bonding (puts on lens surface)
39
What are 4 problems of photochromic lenses?
- car windows block nearly all UV - temperature dependent (darkens less in higher temp and more in the cold) - red light infrared radiation makes the lens return to tits lighter state (darken more skiing, less at the beach) - takes longer to fade when going indoors
40
T/F: photochromic lenses block 100% of UV rays without the need for an added UV lens treatment
True
41
T/F: A/R coatings enhance visual clarity and comfort without reductions sun-reactive performance. They can also increase the sensitivity and decrease reaction time
True
42
Lenses that have optimal balance between darkness, clarity, and feedback speed (darken in random patterns)
Transitions signature
43
Lenses with variable polarization as lens darkens (darken and align)
Transitions vantage
44
Transitions with the darkest lenses, even at high temps. They respond to UV and natural light
Transitions XTRActive
45
Transitions that are polarized and the color and density change in brighter conditions. Low light levels (green/yellow) and higher light levels (dark red/brown)
Transitions DriveWear
46
Mirror coating with a hint of color
Flash mirror
47
Mirror coating can absorb from __ more light than non-mirrored surfaces
5-65%
48
Mirror coating with high density of color, and a higher % of reflectance
Solid mirror
49
What are some pros of mirror coatings?
- reduces glare - easy to clean - repeals minister, fingerprints, and smudging
50
Tints darker than ___ should be avoided
8%
51
Worn for cosmetic appeal, visual comfort, protection, or all 3
Sunglasses
52
Lenses that reduce the intensity of light reflections
Polarized lenses
53
Who are some people/activities that would want polarized lenses?
- fishing - driving - golfers - cyclists
54
What are some cons regarding polarized lenses?
- reduces ability to identity changes in terrain or identify ice - changes brightness of snow so it can be dangerous and nauseating for skiers - can wash out texture of grass making greens difficult to read - commercial pilots
55
Tints that are consistent in color and depth over the entire lens
Solid tints
56
Tints with variable color throughout the lens
Gradient tints
57
Contains two tints that is darker on the top and lighter at the bottom
Double gradient tints
58
How is glass tinted?
By mixing metals directly into the glass
59
How is CR39 tinted?
Can be dipped into a solution that dyes lenses
60
The longer the exposure to a dye, the ____ the tint (CR39)
Darker
61
A lens where its impervious to duke so the scratch resistant coating is dyed instead
Polycarbonate
62
Is trivex tintable?
Yep
63
In hi index lenses, tinting is ___ and can require special processes
Slow

O Optics B11 (4 decks)

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