Quiz For Polycarbonate Lenses

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

1. AR coating
2. UV protection
3. high index
4. polarization

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

The effects of low ABBE value can be minimized by:

1. selecting smaller eyesizes
2. selecting larger eyesizes
3. polishing the edges
4. horizontal and vertical decentration

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

Among the early quality issues with polycarbonate lenses were:

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

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

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

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

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

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

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

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

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

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

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

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

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.

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.

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

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

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

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

The Abbe number of all high index plastics ranges between:

Lens materials with lower Abbe numbers:

When selecting a frame for use with polycarbonate lenses:

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

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

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