Founded in 1919, Duffens Optical is a full-service optical laboratory that provides services to eye care practitioners. Its products include frames, as well as contact, photochromic, tint and polarized lenses. The company provides a variety of products manufactured by Titmus, Hudson, On Guard, Aden and Essilor. It additionally offers products from Transitions, Definity, Nikon, Varilux and Gentex Optics. The company provides technical support, training, online ordering, tracking and delivery services, as well as coating and finishing solutions. It has more than 10 laboratories throughout the United States and maintains offices in Texas, Kansas, Missouri, Colorado and Oklahoma. Duffens Optical maintains one of its locations in Denver.