While it doesn’t happen often, a new lens material has been launched; X-Cel Optical’s new Tribrid
lens is made with a monomer from PPG.
Eyecare professionals are always looking for state-of-the-art frames, lenses and accessories to differentiate their practices from their competitors. As many lens materials are becoming a “commodity” item to the eyeglass-wearing public, a new material is primed for recognition, Tribrid.
PPG, the inventor of CR-39 and Trivex, has now introduced Tribrid lens material for patients with high prescriptions. The material itself is a high technology blend of traditional high index technology and the proven chemistry of Trivex. The result, crisp optics and vision for patients with prescriptions up to +/-7.00D in power.
Tribrid lenses also feature 100% UVA/UVB protection benefit in a lens without sacrificing visual clarity (with an Abbe value of 41) usually associated with a 1.60 index material. Patient comfort and safety are two other important features. With a specific gravity of 1.21 g/cm3, Tribrid is the top lens choice for a lightweight high-index lens and five times more impact resistant than conventional high-index lenses.
Tribrid lenses share many attributes with Trivex. The break point or modulus is much higher than conventional high-index lenses, providing superior “wearability” for patients who enjoy three-piece drill mount or compression mount frame styles.
This lens material processes as easily as conventional high-index lenses. No special edging wheels, processing or additional tooling are required. In eyewear assembly, Tribrid material is easy to edge, groove for semi-rimless, drill and mount for three-piece frame styles with much less risk of chipping or cracking the lens during final assembly and spectacle alignment. Tribrid outperforms conventional 1.60 and 1.67 index in rimless frame designs in Colts Laboratories lateral bridge frame testing.
The chemistry of Tribrid lens material provides superior resistance to cracking and crazing from lab chemicals and solutions. Furthermore, Tribrid is resistant to many household chemicals such as isopropyl alcohol. The surface of the material has an excellent hardcoat adhesion factor and readily accepts a wide variety of anti-reflective, backside spin and dip coatings. In addition, the material is fully compatible in processing with today’s advanced digital surfacing technology.
For the ECP, Tribrid offers broad appeal to patients with an active lifestyle, presbyopic corrections and for those who love the delicate rimless eyewear styles. Monetarily, Tribrid offers uniqueness to the ECP’s lens offerings by maintaining a healthy profit margin and staving off price erosion.
Last year, in August, X-Cel Optical Co., a wholly owned subsidiary of Essilor of America, Inc. and a division of Essilor of America’s Independent Distribution Division, announced the launch of Tribrid lenses. n
Richard W. McCoy, LDO, ABOC, NCLEC, is program director, opticianry at Reynolds Community College in Richmond, VA.