Composite curved lightguides including prescription layers and/or protective layers are bonded together using index-matched adhesives. To obtain total internal reflection within the lightguide, a Chiolite layer is included on at least one side of the lightguide. For example, a Chiolite layer is included between the lightguide and an outer, world-facing protective layer, which is index matched to the lightguide. Due to the moisture susceptibility of the Chiolite, the adhesive coats the Chiolite layer to provide a moisture barrier.
Tu, Thanh; Tung, Yeh-Jiun; Cakmakci, Ozan; Shi, Hongqin; Dunphy, James; and Martinez, Oscar, "Low Refractive Index Coating and Index Matched Adhesive Bonding for Lightguide Applications", Technical Disclosure Commons, (November 17, 2017)