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Trilogy™ Lenses: Questions & Answers

What makes Trilogy™ lenses so special?
Trilogy lenses are the first to deliver a great combination of quality optics, lightweight/thinness, and high impact resistance.

How can Trilogy lenses do this?
Polycarbonate is a thermoplastic, which gives it its strength. Hard resin products are thermosets, which give them good stability in processing and good optical performance. Trilogy is a “quasi-thermoset/thermoplastic”, combining the best of both materials.

What is the difference between Younger’s Trilogy product and PPG Industries’ Trivex™ product?
Trivex is the monomer produced by PPG that is used to make Trilogy lenses. The production methods and specific formulation used for Trilogy lenses has been maximized to provide the best possible lens properties with no sacrifice in impact strength.

What is the difference between Younger’s Trilogy lenses and Hoya’s Phoenix lenses?
While both Trilogy and Phoenix lenses are made from Trivex, the production methods and the formulations are different.

Do Younger and Hoya have exclusive rights to use Trivex material?
Younger and Hoya have been designated by PPG Industries as the Trivex launch partners. Other manufacturers and their progressive styles may begin to enter the market by mid-2002.

How will Trilogy lenses be priced?
These high performance lenses will be priced in the premium mid-index range.

Are Trilogy lenses a replacement for Polycarbonate?
Absolutely not! Polycarbonate presents a fine bundle of properties at an excellent price. Trilogy will be a premium addition to the family of impact resistant products, and should help widen their use, not restrict it.

Before Trilogy, if an ECP wanted impact resistance yet had a concern regarding optics or Abbe value, they had a difficult decision. Now Trilogy offers Performance without Compromise™, and should help grow the market for all impact resistant materials, including polycarbonate.

Should I use Trilogy for children’s Rx’s?
Yes. Trilogy lenses may have the perfect combination of impact resistance, excellent optics, and lightweight qualities that are important in children’s eyewear*.

When will I want to prescribe Trilogy vs. other materials?
Use Trilogy lenses whenever you need to balance the best properties of excellent optics, lightweight, and impact resistance.

How well do Trilogy lenses work with the new stylish 3 piece frames?
They are excellent! This is where the unique properties of Trilogy lenses really shine! Trilogy lenses take a beautiful edge polish, and when ground down to 1.0 mm, they really make a superb looking product.


SPECIFICATIONS

What is the refractive index for Trilogy lenses?
nd = 1.53

What is Trilogy’s specific gravity?
1.11, which makes it the lightest material on the market.

What is the Abbe value for Trilogy lenses?
45.

Is Abbe value important for anything but the highest Rx’s?
While Abbe number does become more critical to good vision as lens power increases, the best optical performance will result from the highest Abbe value.


PROCESSING

How thin can I process Trilogy lenses and keep good optical performance?
Trilogy lenses can be ground down to 1.0 mm center thicknesses and still retain excellent optics.

Do Trilogy lenses process more like hard resin or polycarbonate products?
Although they can be processed in a variety of ways, they appear to process more like polycarbonate.

Can Trilogy lenses be tinted?
Absolutely! You may need to experiment a little with color and time, but Trilogy lenses tint quite rapidly. Use soap and water to clean the lens prior to tinting. Do not use acetone to clean the uncoated surface because it can lead to uneven tinting. For best tint results, the surface must be properly polished.

Do Trilogy lenses need backside coatings?
While Trilogy lenses are not as scratch-resistant as hard resin lenses, test results indicate that Trilogy lenses have inherent scratch resistance equal to or better than many mid-index products regularly processed without a backside coating.


IMPACT RESISTANCE

Are Trilogy lenses as impact resistant as polycarbonate?
Trilogy and polycarbonate have comparable impact performance.

It is challenging to define absolute impact performance when two plastics are as different as polycarbonate and Trilogy, and when both have such high intrinsic strength. In some tests, Trilogy is obviously stronger than polycarbonate. In other tests, polycarbonate does better than Trilogy. However, regardless of the test technique, both materials far exceed the impact performance of other lens materials. Please review the attached graph that represents the magnitude of this safety margin, even when Trilogy and polycarbonate lenses are surfaced to only 1mm center thickness.
Impact Performance Graph


Does Trilogy qualify under “Duty to Warn”?
With the advent of Trilogy, impact resistance specifications must be reexamined. Duty to Warn discussions refer to polycarbonate. Trilogy was not available when OLA’s “Duty to Warn” literature was developed.

One of the ways Younger qualifies impact resistance on each batch of Trilogy lenses is by using an extremely severe impact test. In this test a 1.1 lb sharpened steel missile is dropped onto the part from a height of 50 inches. This test will actually pierce a hole through polycarbonate while still leaving Trilogy lenses intact at the same thickness.
Trilogy ImpactPolycarbonate Impact


What happens to impact resistance when coatings are applied?
Most coatings, especially those applied to the back surface, will reduce a lens’ impact strength. Trilogy and polycarbonate both experience some loss of impact strength with most hard and AR coatings.

Trilogy has the advantage of inherently higher scratch resistance. Therefore, Trilogy can be dispensed without a backside coating, while polycarbonate must be coated on both sides.

For the most impact protection, avoid adding extra coatings to the lens*.

Can Trilogy lenses be hard and AR coated?
The good news is that both Trilogy and polycarbonate have sufficient reserve strength to be dispensed in thin sections and still exceed FDA requirements once hard and AR coated*.


*Note: Impact resistant lenses are neither shatterproof nor unbreakable. Coatings may alter the impact resistance of any lens material. Any modification of Trilogy or polycarbonate lenses, other than normal surfacing or edging, will require impact testing to assure compliance with the FDA specifications. 

 

 
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