Pressure sensitive adhesive light guides

An optical device comprising:

• a light source;
• and
• an optical article comprising:
• an acid-free, non-yellowing pressure sensitive adhesive light guide, wherein the light source is optically coupled to the acid-free, non-yellowing pressure sensitive adhesive light guide such that light emitted by the light source enters the acid-free, non-yellowing pressure sensitive adhesive light guide and is transported within the acid-free, non-yellowing pressure sensitive adhesive light guide by total internal reflection, and wherein the acid-free, non-yellowing pressure sensitive adhesive light guide comprises a first plurality of features oriented to extract light being transported within the acid-free, non-yellowing pressure sensitive adhesive light guide.