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O Optics B11 > Environmental Applications > Flashcards

Environmental Applications Flashcards

1
Q

consists of two polarized filters, one on the top and one on the bottom of the instrument with their absorption are perpendicular, i.e., cross-polarized

A

Polariscope (colmascope)

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2
Q

Two tests used to verify impact resistance?

A
  • high mass impact

- high velocity impact

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3
Q

Tempering or toughening of glass lenses

A

Heat treatment

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4
Q

What are 2 things required for glass lenses hardening?

A

Heat treatment and chemical treatment

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5
Q

chemical tempering, the process of increasing the impact resistance of glass lenses by immersing them in a bath of molten potassium nitrate

A

Chemical treatment

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6
Q

What treatment has a greater impact resistance, chemical or heat?

A

Chemical

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7
Q

What treatment can be applied to objects of complex shape, chemical or heat?

A

Chemical

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8
Q

What are 2 pros regarding heat treatment?

A
  • its quick

- equipment is inexpensive

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9
Q

A normal lenses placed between the filters of a polariscope appears ___

A

Uniformly dark

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10
Q

What type of lens demonstrates stress patterns (Maltese Cross)?

A

Tempered lens

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11
Q

When giving lenses what do you need to put beside a lens with variable tint?

A

V

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12
Q

When giving lenses what do you need to put beside a lens with special purpose?

A

S

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13
Q

For a impacted rated plano, how is it marked?

A

Z87+

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14
Q

For a impact rated rx, what would you mark?

A

Z87-2+

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15
Q

Glasses aimed at those with color deficiency or those working with veins and blood

A

Oxy-ISO glasses

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16
Q

What 2 lenses are used for color deficiency?

A
  • enchroma

- oxy-ISO glasses

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17
Q

These glasses enhances the O2 signal from

hemoglobin under the skin -> -> -> amplifies the perception of veins under the skin

A

Oxy-ISO glasses

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18
Q

Two frames that passed NASA’s rigorous testing and
will be worn by astronauts. And supplies the interchangeable magnetic rx lenses. It takes off weight and keeps you from not bringing multiple glasses.

A

Switch vision

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19
Q

Movie theaters use these

A

Close caption glasses

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20
Q

Glasses that record you

A

Snap spectacles

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21
Q

Bone conduction tech so you don’t need earphones, touch interface to control music and calls

A

Conduction technology

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22
Q

Liquid lenses that change shape according to the distance of objects

A

Smart glasses

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23
Q

Smart glasses are made from what?

A

Glycerin

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24
Q

How many long does it take smart glasses to adjust?

A

14 milliseconds

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25
Q

How do anti-reflection coating work?

A

They produce two reflection which interfere destructively with each other

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26
Q

The coating applied to the lens surface is ___of the wavelength of light thick

A

1/4

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27
Q

The reflected path from the back of the AR coating will be ___ longer

A

1/2 wavelength

28
Q

Light reflected from the back of the AR coating is ___ degrees out of phase from light reflected from the front

A

180

29
Q

The amplitude of the light reflected at each surface of the AR coating is equal what will happen?

A

They will cancel each other out

30
Q

Where the amplitude of light reflected from
each surface of an AR coating is equal and, if 180 degrees out of phase, will cancel each other out. For this to occur, the refractive index of the coating must be equal to the square root of the refractive index of the lens material”

A

Amplitude condition of AR coating

31
Q

Why do you need multiple layers of different indices?

A

Because they are wavelength specific

32
Q

Original glass photochromic manufacturers

A

Corning photochromic

33
Q

The reactions of the glass photochromic lens are mediated by?

A

Atoms of silver

34
Q

Designed to reduce glare while driving at night

A

DriveSafe Lenses

35
Q

Lenses that changes in the size of the driver’s pupils is taken into account while driving

A

DriveSafe Lenses with luminance design technology

36
Q

What 3 things do DriveSafe Lenses do?

A
  • produce better vision in low light conditions for safer and more comfortable driving
  • reduced glare at night from oncoming cars or street lights
  • accurate view of the road dashboard and mirrors
37
Q

Progressive lenses that are used for people who want small frames

A

Short-fit progressives

38
Q

You would use these if the B measurements are less than 30

A

Short-fit progressives

39
Q

lens designed to emphasize intermediate and near vision. Used for computer use, office-related tasks

A

Occupational PAL

40
Q

A very wide intermediate, near, with low level of unwanted astigmatism in the periphery

A

Occupational progressives

41
Q

For people who work inconfined spaces that need to

see up close, above and below them, without moving their heads

A

Double segment flat top bifocals

42
Q

Lenses where the bottom is near, top is near, and remainder is distance

A

Double segment flat top bifocals

43
Q

Lenses where the bottom is near, the top is intermediate or near, and the remainder is distance

A

DD Occupational lens (tri)

44
Q

lens placed in a frame which looks like the lens for the opposite eye to balance appearance andweight

A

Balance lens

45
Q

a lens style where both the front and back surfaces are plus

A

Bi-convex

46
Q

A lens style where both front and back surfaces are minus

A

Bi-concave

47
Q

Indicates the designated eye is not sighted, so the same number should be entered for both eyes; similar in thickness and style, but no specific Rx power

A

Balance lenses

48
Q

distance only correction in one eye, near vision

correction in the other eye

A

Monovision

49
Q

With monovision, the eye that sees distance well will be blurred ___ and the eye that sees near will be blurred at ____

A

Sees distance: blurred up close

Sees near: blurred at distance

50
Q

What eye is usually used for distance vision

A

Dominant eye

51
Q

What are 4 limitations of monovision

A
  • Distant objects appear slightly blurred
  • Lack of intermediate vision
  • Doesn’t provide adequate near vision for sustained reading
  • Although the two eyes still work together, binocular vision is compromised, causing a decrease in depth perception
52
Q

Lenses generally used to correct extreme hyperopia.

A

Lenticular lenses

53
Q

In order to limit the thickness and weight that a
high-powered lens would normally
require, what happens? (In a lenticular lens)

A

all of the power of the lens is concentrated in a small area in the center

54
Q

A minus lenticular lens. Used for high minus corrections

A

Myodisc

55
Q

What are some ways you can reduce thickness regarding frame shape and size

A
  • smaller lens opening

- less wide, less tall, rounder the better

56
Q

For a plus rx what do you want to do to reduce thickness (regarding shape and size?

A

Smaller a good idea but less impact than minus rx

57
Q

To reduce thickness what type of frame do you want to avoid?

A

Rimless and semi-rimless

58
Q

To reduce thickness what type of frame do you want to hide the thickness?

A

Full plastic frame

59
Q

What are the pros of polishing lenses?

A

Exposed edges are polished to enhance finished invisible look of lens

60
Q

What are the cons of polishing lens?

A

Seeing rainbows

61
Q

What are the techniques used to reduce thickness?

A
  • round shape
  • smaller lens opening
  • full plastic frames
  • lens edging choices that hide thickness
  • high index lenses
  • roll and polish
  • centering the OC over GC
  • edge painting (edge matched to frame color)
62
Q

flatter base curves result in ___ lenses, but steeper

base curves have less ___

A

Thinner lenses and less distortion

63
Q

How long should it take patients to adapt to small base curves?

A

Within a week

64
Q

Do you want to keep base curve similar/same between the two eyes and similar/same as previous base curves?

A

Yes

65
Q

What are some complaints people have when they have polycarbonate lenses?

A

Complaints about VA and chromatic aberrations

66
Q

Polycarbonate has a ___ abbe value

A

Low

O Optics B11 (4 decks)

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