Dispensing Final

Question 1

Which factor is normally NOT considered essential in fitting th progressive add

Answer 1

Specificying the nasal rotation of the ptrogressive channel

Question 2

The fitting cross for a general purpose ptorgressive addition lens would be fitted higher than specified by the lens manufacturer in what condition

Answer 2

The progressive is used to inhibit accommodative esotropia in children

Question 3

when children are fin with ptrogressive addition lenses, yet still have the ability to accomodate just as other children do, the fitting cross is usually fit

Answer 3

4mm above pupil center

Question 4

Children fitted with progressive addition lenses should not wear those lenses for sports or play ? T or F

Answer 4

False

Question 5

Progressive lens fitting crosses should be set lower for the first-time wearer to aid in adapting to the lenses T or F

Answer 5

False

Question 6

Prism is verified at a different locationo n the ptrogressive add lens from where the distance Rx is verified? T or F

Answer 6

True

Question 7

The fitting cross is at the major reference point? T or F

Answer 7

False

Question 8

A synonym for major reference point is?

Answer 8

prism reference point

Question 9

If a progressive lens design changes as ad power changes, the lens is called a mulitdesign lens? T or F

Answer 9

True

Question 10

Adaptation to progressive addition lenses involves changes in the respective eye and head movements used in fixation

Answer 10

True

Question 11

Although all of the factors listed below are important in the fitting of ptrogressive addition lenses, which factor has the most influence on wearer satifaction

Answer 11

fitting accuracy

Question 12

In practice the power of the near addition is seldom measured when verifying progressive lenses

Answer 12

True

Question 13

What method for viewing the hidden markings on a progressive addition lens is NOT suggested

Answer 13

Hold the lens so that its surface may be viewed in a mirror by reflected light

Question 14

A frame has been selected for a progressive addition lens wearer. Some of the parameters of the frame and frame fitting are listed…..What would be considered problematic?

Answer 14

The laboratory order form specifies a binocular distance PD of 65

The frame is an aviator shape

Question 15

When a wearer does come back with a compleain, the most straighforward wat to check for possible problems is to first put the progressive markings back on the lenses and see if they are correct in relation to where they shoul be when the rx is worn? T of F

Answer 15

True

Question 16

Unwanted peripheral cylinder power in a progressive add lense, increases how?

Answer 16

Increases as the add power increases

Question 17

Compared with a soft design, a hard design usually provides a wider area of high visual acuity in the distance portion of the lens. T of F?

Answer 17

True

Question 18

Progressive power can change from distance to near zones in either a rapid or slow fashion. If it changes in a rapid fashion, then what will not occur?

Answer 18

The near zone is generally smaller

Question 19

Distance and intermeidate and near zone widths influence each other. When one zone is made larger or wider, teh other two zones will become narrower or smaller? T of F

Answer 19

True

Question 20

Contour plots record the surface elevation for the front surface of a ptrogressive addition lens. T or F

Answer 20

False

Question 21

What is not demonstrated by contour plots

Answer 21

The expected increase or decrease in chromatic abberation throughout the lens

Question 22

What lens design is more likely to have higher amoutns of peripheral astigmatism

Answer 22

Hard design

Question 23

Would a prgoressive add lens with a spherical upper front surfaces be more likely hard or soft?

Answer 23

Hard

Question 24

Is a progressive addition lens specifically designe for frames with a narrow B dimenstion more likely to resembel a hard or soft design

Answer 24

Hard

Question 25

Is a presbyoopic emmetrope who is used to crystal clear distance vision more likely to complain about a progressive addition lens with a hard or soft design

Answer 25

soft

Question 26

Whihc lenst type does NOT requrie free-form type of lens generating to make the lens

Answer 26

Progressive made as semifinished lenses and completed in labratory

Question 27

Position of wear lenses are able to correct or comepensate for all but which of the following?

Answer 27

``` It can correct everything vertex distance panto change base curve induced cyl/sphere ```

Question 28

near variable focus lenses have a powere degression..Degression is??

Answer 28

The range in power of a variable focus lens from the total near power of the lens to the power found at the top of th lens

Question 29

Near variable focus lenses are used for small office environments, and all have 50% of the add poewr in the upper portion of the lens? T of F

Answer 29

False

Question 30

Near variable focus lens design will be used for presbyopes with all differnt amounts of add power. How many power ranges do near varialbe focus lenses have for each particular brand?

Answer 30

1, 2, 3...as man as there are add powers

Question 31

Suppose a variable focus lens made by a certain manufacturer comes with a recommended power range of 1.25 fore weares who have a +2.25 add. This particular wearer has a distance correction of -0.50 +0.75 x 090 for OD and OS...and an add of +2.25.. What pwere would be verified in the upper portion of the lens?

Answer 31

+0.50 +.75 x 090

Question 32

A near variable focus lens has a +1.25 -0.50 x010 power in the upper portion of the lens. It has a power of +2.75 -0,50 x 010 in the lower portion what is the degression (power range) of the lens?

Answer 32

+1.50

Question 33

Near variable focus lense are all fit exactly like standard progressive addition lenses, measuring monocular PDs and placing the fitting cross under the pupil?

Answer 33

False

Question 34

No occupational progressive lenses meant for small offices and computers come with distance powers in the top of the lens-onlyintermediate powers? T or F

Answer 34

False

Question 35

Usint the rule of thumb for prism thinning of progressvie addition lenses how much prism thinning would be expected for the follwoing +3.00 -0.75 x 090 add +2.25 -3.00DS ad +1.00

Answer 35

1.5pd BD None required

Question 36

+3.00 -0.75 x 130 add 1.50 what prism thinning should be giving?

Answer 36

0.75pd

Question 37

For progressive addition lens how much yoked BD should be given -3.50 -0.50 x 180 add +2.00

Answer 37

none

Question 38

Lenses are surfaced in a finishing Lab? T or F

Answer 38

False

Question 39

which type of lens has the same power over the entire lens

Answer 39

Single vision lens

Question 40

What term is a synonym for a finished lens?

Answer 40

Uncut lens

Question 41

A frame tracer is often used in conjuction with?

Answer 41

a lens blocker

Question 42

Of the steps in lens fabrication, which process occurs last?

Answer 42

Edging

Question 43

What is the proper steps in the edging process?

Answer 43

Find lens axis and MRP location, Centration, Blcoking, Edging

Question 44

When spotting a single vision lens for edging in reference to edged lense orientation the lensmeter ing dots will be on?

Answer 44

the cylinder meridian

Question 45

Whigh point should always appear either exactly in front of (or somewhat below) the wearer's pupil

Answer 45

geometric center

Question 46

If there is no prescrived presim in the prescription, what point will not be the same?

Answer 46

NRP

Question 47

Horizontal pattern size is measured horizontally through the central hole in the pattern? T or F

Answer 47

False

Question 48

For a plano cylinder, light passes through the ( ) meridian undeivated

Answer 48

Axis

Question 49

The longer the wavelentht of the UV rays, the greater the likelihood of biologic damage? T or F

Answer 49

False

Question 50

Single, high-level amounts of UB radiation can be damaging, but the eye is able to recover from long-term, low level amounts of UV exposure with out being affected? T or F

Answer 50

False

Question 51

A persons ability to work effectively under a situation of reduced illumination increases with age? T or F

Answer 51

False

Question 52

Coatins for plastic lenses are purely for scratch resistance and have no AE properies

Answer 52

False

Question 53

When a int and an AR coating are both desired, plastic lenses should be dyed before the AR coating is appleid?

Answer 53

True

Question 54

Although in certain instances acuity may increase when a 10% neutral-density filter is worn in bruight sunligh, persons older than age 40 years experience poorer vision if the filter is darker than 10%

Answer 54

True

Question 55

Normal transmission for average sunglasses runs between 15% and 30%

Answer 55

True

Question 56

Exposure to sunlight over an extended period of time will reduce the time needed for the eye to dark adapt

Answer 56

False

Question 57

Yellos tints help nighttime driving becuase they eliminate blue haze

Answer 57

False

Question 58

With AR coatins, it is possible to have any one of a range of reflex colors or no color at all and still produce an efficient coating

Answer 58

True

Question 59

The quality of the AR coating is not indicated by the eveness of the reflex color of the coating

Answer 59

False

Question 60

An AR coating will make a lightly tinted lens perform better at night than it otherwise would perform with the tint but no AR coating

Answer 60

True

Question 61

The process of adding an AR coating to a tinted plastic lens sometiems chanegs the color of the tint

Answer 61

True

Question 62

AR coating the back surface of a pair of sunglasses is not advisabel because it lets more light throught the lens

Answer 62

False

Question 63

An AR-coated lens is best cleaned in office by using an ultrasonic cleaner

Answer 63

False

Question 64

An AR coated lens is helpted by use of an antifog or antistatic agent

Answer 64

False

Question 65

Mirror coating provided good prote tion from sunlight if combined with a tint but allows more UV and IR than a nonmirrore coated lens of equal transmission

Answer 65

False

Question 66

What type of light is an AR coating most effective against

Answer 66

light entering straigt on

Question 67

An antiscrath coating is usually affected by exposure to antitfog and antistatic agents

Answer 67

Flase

Question 68

UV or color dyeing a plastic photchromic lens makes the pthochromic aspects of th lens work better

Answer 68

False

Question 69

Lense that absorb the short end of the visible spectrum may help reduce some types of glare

Answer 69

True

Question 70

In denoting the amount of light absorbed by the lens, if numbers such as 1,2,3 are used, the higher the number the more light is allowed to pass the lens?

Answer 70

False

Question 71

There is no such thing as a glare control dye

Answer 71

False

Question 72

Glare control type lenses will not cause a decrease in scores on standardized color testing for color dectives

Answer 72

False

Question 73

For neutral gray glass sun lens of plus power with the tint in the glass, as plsu power increases??

Answer 73

the transmission decreases

Question 74

Which UV radiation has the longest wavelength

Answer 74

UVA

Question 75

What ocular condition is associated with with increasing severity with increased sun exposure

Answer 75

Cataracts

Question 76

Glass blower's cataract is believed to be caused by?

Answer 76

IR radiation

Question 77

A light pink tint is good for?

Answer 77

Even absorption across the visible spectrum

Question 78

A yellow ting is good for?

Answer 78

Adviasable for night driving Skiing increased contrast

Question 79

Gray tints are good for?

Answer 79

God for color defectives

Question 80

Green tints are good for

Answer 80

Highest transmissions of visible light found in the middle of the visible spectrum

Question 81

Poor IR absorption is associated with?

Answer 81

Dyed plastic lens

Question 82

Tint varies with thickness??

Answer 82

Tinted glass

Question 83

A color deficient individual will readapt to the induced color changes for which of the following lenses?

Answer 83

NONE

Question 84

As a secondary effect, antiscratch coatings will??

Answer 84

reduce lens reflections

Question 85

what is the most effective method to use when attempting to match a new glass photochromic replacement lens with an older glass phtotchromic lens?

Answer 85

Reharden the old lens with the new

Question 86

A person has new lenses and has been wearing them for a month. SHe now decides she would like to have them AR coated. THe lenses are lightly scratched. IF the lenses are then AR coated??

Answer 86

Teh scratches will be more evident

Question 87

A pair of glasses with SRC lenses is best adjusted using?

Answer 87

a forced air warmers

Question 88

Disregarding impact resistance and taking only transmission characteristics into consideration which method is best for hardiening a photochromic lense

Answer 88

chemical temper

Question 89

What color lens is "Kalichrome H"

Answer 89

Yellow

Question 90

the tint may be remoced and reapplied for which types of lenses

Answer 90

vacuum coated and plastic

Question 91

What lenses should not be AR coated

Answer 91

Lightly tinted glass lenses sun lenses glass photchromic lenses -can all be AR coated

Question 92

The problem of annoytin internal lens reflections occurs most often in?

Answer 92

Low minus powered clear lenses

Question 93

what contributes to the rapid darkeingin of a photochromic lense

Answer 93

UV, Previous exposrues and cold

Question 94

A polarizing ophthalmic lens should be orientated so as to eliminate

Answer 94

horizontally vibrating waves

Question 95

A prescription ground polarizing lens is characterized by

Answer 95

a stretched sheet of polyvinyl alcohol

Question 96

when inserting a lens, if success is not achieved on the first try, heat the fram and the partially inserted lens together, then push the partially inserted lens the rest of the way into the bevel?

Answer 96

False

Question 97

The lower eyewireof the frame is rolled forward when the lense is inserted. After several attempts to straighten it and reinser the lens, the forward rolled eyewire still reamisn a problem. One solution is to straigten the eyewire and try inserting the lens from the back

Answer 97

True

Question 98

If salt from a solat pan sticks to the frame, what ma be done to alleviate the problem

Answer 98

Add talcum powder to the salt

Question 99

A pair of edged multifocal lenses are helt back to back. Their segemtns overlap exactly. WHich of the follwoing statements hould NOT be made?

Answer 99

The cylinder axes are correct There will ne no unwanted vertical prism in the prescription

Question 100

The best way to heat nylon frames is ??

Answer 100

hot water

Question 101

what type of frame may be heated until it bends under its own wight

Answer 101

Optyl

Question 102

what frame materials shrink when plunged into cold H2O

Answer 102

cellulose acetate | propionate

Question 103

What fram materials may shring when heated

Answer 103

polyamide

Question 104

which frame material do best by cold snapping the lenses into place

Answer 104

polyamide carbon fiber polycarbonate

Question 105

Types of frames that do not adjust well are?

Answer 105

polycarboanate | carbon fiber

Question 106

polycarbonate frames neither stretch nor shringk when heated

Answer 106

True

Question 107

A paire of frames is labeled Optyl. the temples have metal reinforcing running the length of th temples. These temples ??

Answer 107

Do not require very much heat before adjusting

Question 108

To remove lenses after a cellulose acetate frame is heated, it is easiest to push a lens out by placing the thumbs on the?

Answer 108

Back side of the lens inferiro nasally, pushing the lens with the thumbs while pulling the eyewire with the fingers

Question 109

Eyewire closure pliers are used?

Answer 109

to close the eyewire of a metal frame around the lens to allow for lens size evaluation

Question 110

When restringing a nylon cord mounting, the ends of the cord are threaded through two holes in the nasal and two holes in the tempral side of the fram. WHich hole is threaded first?

Answer 110

The cord is always threaded through the lower hole first

Question 111

We are inserting a grooved lens in a nylon cord frame. The nylon cord is the correct length and in the mounting. Now the upper part of the lens is pressed into the upper eyewire of the frame. WHen this is being done, where should the cord be?

Answer 111

On the front surface of the lens

Question 112

To get the end of a nylon cord out of the groove mounting when it is stuck in the groove, the best thing to use is?

Answer 112

a dental pick

Question 113

When the cord of a nylon cord fram has lost its elasticity, remove the lens and heat the cordthis will shrink the cord, retightening the lens. THe lens will remain tight almost as long as it did after first being inserted?

Answer 113

False

Question 114

WHen the lense is complegely inserted into the frame bevel, yet the lower edge appears to be sticking out slightly, what is the problem most likely to be?

Answer 114

A rolled eyewire

Question 115

What type of lens will not give evidence of being twisted or rotated in the frame when being checken in a lensometer

Answer 115

spherical lens

Question 116

If a cellulose acetate fram has been stretched by a previous lens that was ground too large (making the new lenses too small for the frame) what is the best way to remedy the problem?

Answer 116

lheat th frame and plunge it into cold water

Question 117

A pair of glasses is being verified. One lens is obviosuly in a rotated position, yet the axis of the cylinder for this lens is correct when read on the lensometer. What might be the cause

Answer 117

Lens was edged off axis

Question 118

what is the easiest way to chck fo a rotated lens after lens inseration when the lenses are flat top multifocals?

Answer 118

use a straight edge and hold it along the top of both multifocal segments. Both seg tops should be parallel to the straight edge.

Question 119

If a person with a high minus spectacle Rx swithces to contact lenses, the power in the contact lens would be ( ) the power in the spectacle lens??

Answer 119

Less than

Question 120

If a single vision lens is placed in the lensometer in the reverse position (concave side toward the ovserver) the poewr value obtained is a masure of the ?

Answer 120

front vertex power

Question 121

The back vertex power is greater than the front vertex power if??

Answer 121

A thick lens has a convex front surface and a plan backs urface