Quest Optical Lab Releases New Lens Material
Top Line: Quest Optical Rx Specialty Lab is releasing a new
lens material called Hi-Vex. The material has some unique features that make it optimal not only for free-form lens processing but also as a high velocity impact resistant lens.Close Up: Hi-Vex Abbe value of 46 has minimal longitudinal aberration and will assure superb visual performance in terms of clarity and sharpness of image even at high powerRx or high value prisms, according to Quest. The material’srefractive index is 1.56, which puts it halfway between the refractive indices of poly and Trivex. Consequently, Hi-Vex lenses are thinner than Trivex and slightly thicker than poly. Hi-Vex passes the ANSI Z87.1 High Velocity Impact Test,
which makes it an excellent lens material choice for children’s eyewear, sports eyewear, andsafety eyewear. The specific gravity is 1.25 g/cm3 which makes it 2 percent heavier than polyand 8 percent lighter than CR-39 [monomer by PPG] which makes it an excellent choice for wearers who want to enjoy a light wearing experience. Hi-Vex has also passed the Drilled Hole Lens Strength and Safety Test of Z87 by COLTS Lab, making it is an excellent choice for drilling and other rimless mounts. Hi-Vex has 100 percent UVA and UVB protection. “Hi-Vex material’s additional significant advantages is ease of processing on high definition lab equipment,” said
Michael Walach,,President of quest Optical Laboratory, pictured here with a Hi-Vex lens heprocessed. “The Hi-Vex material is brittle like hard resin. When processed on HD single point technology it cuts into powder as opposed to poly or Trivex, which, when cut, pulls continuous thread which gives it a tendency to create a circular pattern on the lens, frequently with a nipple in the center. Also, in the free-form polishing process it has advantage. Due to the Hi-Vex brittle material characteristic the free-form polishing process is notably shorter than on poly or Trivex and the surface quality is as good as on CR-39 [monomer by PPG] or other high-indexmaterials.”
Vital Stats: Hi-Vex is a Conant Optics product and in the US. is distributed by Conant Lens Inc.
in Marietta, Ga. It is available in finished stock lenses and semi-finished blanks. Hi-Vex can also be ordered through Quest Optical Specialty Lab in a wide variety of RXs in SV, FT, HD RS, individually optimized PAL, IO computer, IO SV, and SF blanks, or finished stock. Hi-Vex photochromic SF will be available in the fall 2011.