Quiz For Polycarbonate Lenses

1 point(s)

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children's eyeglasses

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3.0 mm industrial safety lenses

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sports glasses

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ultra thin 1.0 mm lenses for dress eyewear

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high index properties

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safety aspects

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low Abbe numbers

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relatively low specific gravity

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1 only

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2 only

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1 & 2

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1, 2, & 3

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duty to warn

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informed choice

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lens information regulation

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OSHA standards

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1 only

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1 & 2

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1, 2, & 3

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1, 2, 3, & 4

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greatly exceeds federally mandated requirements for impact resistance

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should be the minimum recommended thickness

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does not meet federally mandated requirements for impact resistance

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is thicker than it needs to be for industrial safety purposes

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1 point(s)

Which of the following are inherent, built-in features of polycarbonate lenses?

AR coating
UV protection
high index
polarization

1 & 3

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2 & 4

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3 & 4

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2 & 3

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1 point(s)

When tinting polycarbonate, the maximum exposure time should not exceed:

10 minutes

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20 minutes

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30 minutes

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40 minutes

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1 point(s)

The effects of low ABBE value can be minimized by:

selecting smaller eyesizes
selecting larger eyesizes
polishing the edges
horizontal and vertical decentration

1 & 3

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2 & 4

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1 & 4

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2 & 3

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1 point(s)

Polycarbonate was originally introduced in the ____________as a tough impact- resistant material for bullet-proof windows.

1940s

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1950s

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1960s

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1970s

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1 point(s)

Among the early quality issues with polycarbonate lenses were:

internal stresses which were formed when the lenses were manufactured
black carbon particles which were embedded in the lens material
lenses warping during the edging process
poor impact resistance

1 only

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1 & 2

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1, 2, & 3

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1, 2, 3, & 4

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1 point(s)

When polycarbonate lenses were first introduced for dress use (non-safety), the lenses were available in:

finished stock and semi-finished

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semi-finished only

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stock only

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finished stock multifocals

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1 point(s)

Many of the improvements in the chemistry of polycarbonate resins can be attributed to:

the Polycarbonate Council

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the Optical Laboratories Association

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better surfacing and edging techniques

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the music and movie industry

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1 point(s)

The broad mid-range of prescriptions which fall between _________________are estimated to represent more than 80% of all prescriptions.

-2.00 D and + 2.00 D

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-3.00 D and + 3.00 D

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-3.00 D and + 6.00 D

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-2.00 D and + 6.00 D

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1 point(s)

Some of the reasons why polycarbonate lenses are rapidly gaining popularity include:

the material results in thinner and lighter lenses
it has excellent impact resistance
lens processing equipment has improved
AR coatings have improved

1 & 2

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2 & 3

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1, 2 & 3

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1, 2, 3, & 4

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1 point(s)

It was in the _______________that the optical industry began to realize that there were some potential problems regarding the impact resistance of lens materials.

early 1960s

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mid 1970s

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mid 1980s

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early 1990s

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1 point(s)

A study group set up by the Optical Laboratories Association (OLA) concluded that:

dispensers and doctors have a legal and professional responsibility to make sure patients have all the information required to make an informed decision about lenses and frames.

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it is the patient's responsibility to learn about all the options available to them when selecting eyewear and that they have no grounds for legal action should an eye injury occur

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due to the high degree of impact resistance polycarbonate lenses are not suitable for dress eyewear should be used only for safety lenses

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polycarbonate is not a suitable lens material for use in children's eyewear unless they are ground to a minimum 3.0 mm center thickness on minus lenses and 2.5 mm edge thickness on plus lenses

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1 point(s)

The concept of “Duty to Warn” is important because:

polycarbonate has emerged as a viable lens material for dress eyewear
polycarbonate has a resistance to impact exceeding other materials
most lens styles are now available in polycarbonate
in the event of a lawsuit, the manufacturer and the laboratory are usually brought into the action

1 & 2

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2 & 3

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2, 3 & 4

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1, 2, 3 & 4

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1 point(s)

A commonly used rule of thumb is that all children under the age of ____________years of age should be fit with polycarbonate lenses.

12

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14

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16

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18

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1 point(s)

When polycarbonate lenses are used for children’s eyewear the lens thickness should be ordered:

thicker than standard

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thinner than standard

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standard thickness is suitable in most cases

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1.0 mm super thin

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1 point(s)

It is estimated that over _______________eye injuries occur in and around the home in a single year which underscores the importance of eye safety away from the work place.

50,000

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100,00

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198,000

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298,000

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1 point(s)

Sports vision eyewear is nearly always a second pair and often produces referrals. It is estimated that approximately___________ percent of the eyeglass market comes from sports eyewear.

5

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10

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15

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20

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1 point(s)

A primary limiting factor in the light transmission of ophthalmic lenses is the________________.

Abbe value of the lens material

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specific gravity of the lens material

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thickness of the lenses

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surface reflectivity of the lens material

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1 point(s)

The chemistry involved in applying an AR coating to polycarbonate lens in complicated by the fact that:

all polycarbonate lenses come with a scratch resistant coating

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polycarbonate has a relatively high index of refraction

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polycarbonate is often used in sports and safety eyewear

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polycarbonate is especially light in weight

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1 point(s)

When sending polycarbonate to the lab to be AR coated, it is best to provide the following information:

identify the lens as polycarbonate
if possible, identify the lens brand
identify the lab that processed and scratch-coated the lenses

1 only

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1 & 2

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2 & 3

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1, 2, & 3

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1 point(s)

The Abbe number of all high index plastics ranges between:

30-40

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20-30

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40-50

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50-60

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1 point(s)

Lens materials with lower Abbe numbers:

tend to restrict the use of the material from use as an ophthalmic lens

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have been shown to enhance the visual acuity of most patients

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do not restrict the use of the material from use as an ophthalmic lens

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are more effective at reducing glare

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1 point(s)

When selecting a frame for use with polycarbonate lenses:

keep the patient’s eyes well centered in the eyewire shape
maintain minimum vertex distance
apply adequate pantoscopic tilt
maintain an appropriate amount of face wrap

1 only

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1 & 2

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1, 2, & 3

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1, 2, 3, & 4

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1 point(s)

When tinting polycarbonate_____ of the tint will be absorbed within the first ______.

20 percent / 5 minutes

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50 percent / 20 minutes

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60 percent / 30 minutes

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95 percent / 20 minutes

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1 point(s)

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acetone

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alcohol

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liquid detergent

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plain soapy water

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