Environmental Applications

Question 1

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

Answer 1

Polariscope (colmascope)

Question 2

Two tests used to verify impact resistance?

Answer 2

• high mass impact

- high velocity impact

Question 3

Tempering or toughening of glass lenses

Answer 3

Heat treatment

Question 4

What are 2 things required for glass lenses hardening?

Answer 4

Heat treatment and chemical treatment

Question 5

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

Answer 5

Chemical treatment

Question 6

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

Answer 6

Chemical

Question 7

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

Answer 7

Chemical

Question 8

What are 2 pros regarding heat treatment?

Answer 8

• its quick

- equipment is inexpensive

Question 9

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

Answer 9

Uniformly dark

Question 10

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

Answer 10

Tempered lens

Question 11

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

Answer 11

V

Question 12

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

Answer 12

S

Question 13

For a impacted rated plano, how is it marked?

Answer 13

Z87+

Question 14

For a impact rated rx, what would you mark?

Answer 14

Z87-2+

Question 15

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

Answer 15

Oxy-ISO glasses

Question 16

What 2 lenses are used for color deficiency?

Answer 16

• enchroma

- oxy-ISO glasses

Question 17

These glasses enhances the O2 signal from

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

Answer 17

Oxy-ISO glasses

Question 18

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.

Answer 18

Switch vision

Question 19

Movie theaters use these

Answer 19

Close caption glasses

Question 20

Glasses that record you

Answer 20

Snap spectacles

Question 21

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

Answer 21

Conduction technology

Question 22

Liquid lenses that change shape according to the distance of objects

Answer 22

Smart glasses

Question 23

Smart glasses are made from what?

Answer 23

Glycerin

Question 24

How many long does it take smart glasses to adjust?

Answer 24

14 milliseconds

Question 25

How do anti-reflection coating work?

Answer 25

They produce two reflection which interfere destructively with each other

Question 26

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

Answer 26

1/4

Question 27

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

Answer 27

1/2 wavelength

Question 28

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

Answer 28

180

Question 29

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

Answer 29

They will cancel each other out

Question 30

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”

Answer 30

Amplitude condition of AR coating

Question 31

Why do you need multiple layers of different indices?

Answer 31

Because they are wavelength specific

Question 32

Original glass photochromic manufacturers

Answer 32

Corning photochromic

Question 33

The reactions of the glass photochromic lens are mediated by?

Answer 33

Atoms of silver

Question 34

Designed to reduce glare while driving at night

Answer 34

DriveSafe Lenses

Question 35

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

Answer 35

DriveSafe Lenses with luminance design technology

Question 36

What 3 things do DriveSafe Lenses do?

Answer 36

- 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

Question 37

Progressive lenses that are used for people who want small frames

Answer 37

Short-fit progressives

Question 38

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

Answer 38

Short-fit progressives

Question 39

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

Answer 39

Occupational PAL

Question 40

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

Answer 40

Occupational progressives

Question 41

For people who work inconfined spaces that need to | see up close, above and below them, without moving their heads

Answer 41

Double segment flat top bifocals

Question 42

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

Answer 42

Double segment flat top bifocals

Question 43

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

Answer 43

DD Occupational lens (tri)

Question 44

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

Answer 44

Balance lens

Question 45

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

Answer 45

Bi-convex

Question 46

A lens style where both front and back surfaces are minus

Answer 46

Bi-concave

Question 47

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

Answer 47

Balance lenses

Question 48

distance only correction in one eye, near vision | correction in the other eye

Answer 48

Monovision

Question 49

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

Answer 49

Sees distance: blurred up close | Sees near: blurred at distance

Question 50

What eye is usually used for distance vision

Answer 50

Dominant eye

Question 51

What are 4 limitations of monovision

Answer 51

- 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

Question 52

Lenses generally used to correct extreme hyperopia.

Answer 52

Lenticular lenses

Question 53

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

Answer 53

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

Question 54

A minus lenticular lens. Used for high minus corrections

Answer 54

Myodisc

Question 55

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

Answer 55

- smaller lens opening | - less wide, less tall, rounder the better

Question 56

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

Answer 56

Smaller a good idea but less impact than minus rx

Question 57

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

Answer 57

Rimless and semi-rimless

Question 58

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

Answer 58

Full plastic frame

Question 59

What are the pros of polishing lenses?

Answer 59

Exposed edges are polished to enhance finished invisible look of lens

Question 60

What are the cons of polishing lens?

Answer 60

Seeing rainbows

Question 61

What are the techniques used to reduce thickness?

Answer 61

- 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)

Question 62

flatter base curves result in ___ lenses, but steeper | base curves have less ___

Answer 62

Thinner lenses and less distortion

Question 63

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

Answer 63

Within a week

Question 64

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

Answer 64

Yes

Question 65

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

Answer 65

Complaints about VA and chromatic aberrations

Question 66

Polycarbonate has a ___ abbe value

Answer 66

Low