By LensPT Team Trivex and polycarbonate lenses are worth comparing when an optical business is choosing a material for its assortment or a particular frame program. Start with the prescription, frame and finishing requirements, then compare the exact products available. A material name alone does not establish finished-lens thickness, optical performance or suitability for a […]
By LensPT Team Round-top bifocal lenses have a rounded near segment; flat-top bifocal lenses have a near segment with a straight upper edge. These names describe the segment inside the lens, not the shape of the uncut lens blank or the finished frame. For optical distributors and purchasing teams, the useful comparison starts with the […]
By LensPT Team Published 2026-10-07 Blue cut progressive photo gray lenses combine three features: a progressive optical design, blue-light filtering, and a gray photochromic tint. These features describe different aspects of the lens. The progressive design provides different viewing zones, the blue-cut feature changes the transmission of selected wavelengths, and the photochromic treatment […]
