TRIVEX
--- Optional Extra Hardcoated Only £55.00, Antireflection Coating £15.00 --- Single Vision Only
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- The very latest from the USA also known as TRILOGY and PNX
- This lens is truly amazing ( almost indestructible )
- Very strong and light with high impact resistance
- Ideal for sports protection
- Super for rimless spectacles ( Guaranteed against splitting even in a rimless frame for the life of the prescription )
- UV protection up to 380nm
Trivex - The Tri Performance Lens Material
What is Trivex lens material? |
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Trivex lens material is the world's first tri-performance lens material: offering a triple combination of features never before found in a single material--superior optics, impact resistance, and ultra light weight.
This breakthrough in technology is specifically designed to deliver the most comprehensive performance of any lens material, anywhere.
Visual Armor
Originally Developed As "Visual Armor" For The Military
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PPG Industries adapted the plastics technology in 2001 for use in the ophthalmic industry and called it Trivex lens material because of its unique tri-performance properties.
An entirely new category, Trivex material was the first to offer the combination of excellent optics, strength characteristics and ultra-lightweight qualities in a single lens material.
The growth in demand for lenses made from Trivex material around the world has been unprecedented.
Thisrapid acceptance is a testimony to the material's exceptionalproperties.
Eyecare professionals have discovered that theycan rely on Trivex material, and patients are experiencingits valuable package of benefits.
Because the attributes of Trivex material make it an appealing choice for a variety of patients, manufacturing and distribution partners are continually expanding options in lens types and designs, and new partners are coming onboard.
As the number of lens lines increases in each country, and as availability expands to new countries, the growth trend for Trivex lens material is expected to remain strong into the future.
Lenses made from Trivex material provide sharp vision, protection and comfort.
THE LIGHT AND THIN FEATURE While cosmetics are one factor that eye care professionals and patients consider in choosing a lens, another equally, if not more important factor is optics that provide exceptional visual acuity.
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Specific Gravity
Specific Gravity is a way in which weight of a lens material is specified.
The lower the value, the less dense (and subsequently, lighter) the material is.
The specific gravity of Trivex material is 1.11, this value makes it the lightest of all commonly utilized ophthalmic lens materials currently available.
Compared to the density of Cr39 monomer (1.32), Trivex material is 16% lighter.
Compared to polycarbonate, it is 8% lighter, and nearly 25% lighter than ultra high index (1.66 and 1.74) materials.
When aspheric curvatures are used on Trivex lenses, even more thickness and weight reduction can be achieved.
Refractive Index
Trivex lens material has a 1.53 index of refraction.
This mid-index value enables lenses made from Trivex material to be thinner, lighter and more comfortable.
For example, when compared to lenses made with CR-39 monomer (with an index of 1.50) of the same power and diameter, lenses made from Trivex material are up to 50% thinner and 50% lighter resulting in improved comfort for the wearer.
Abbe Value
Colour aberration in lenses is one area that can impact vision and is usually seen by the patient as colour blurring around objects and a reduction in the clarity of the lenses.
The chromatism problem becomes potentially more troublesome as prescription powers become stronger.
The way to avoid this problem is to use a lens material that has a high Abbe value. Higher index materials, including polycarbonate have Abbe values ranging from 30 to 34. In contrast, lenses made from Trivex material have an Abbe value between 43 and 45 and thereby provide clear, sharp vision without distracting coloured ghost images around objects that can reduce the quality of vision through the lenses.
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The Advantage Of Trivex In Rimless Mountsia
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During the time a person wears a rimless mounting, the lenses and mounting parts flex, this places stress on the lenses.
Because of the flex and stress, the holes of some lens materials tend to stretch out of shape (known as hole elongation) making the lenses loose over time and costly candidates for replacement.
Due to the strength of the material, all holes drilled in lenses made from Trivex material retain their shape, ensuring a secure fit for the life of the glasses.