Drug delivery device assembly and accessory for drug delivery device

A drug delivery device assembly comprising:

• an injector housing having a body with a proximal end, a distal end, a longitudinal axis extending between the proximal end and the distal end, and a window;
• a needle assembly at least partially disposed within the body, the needle assembly comprising a syringe barrel containing a medicament and a needle or a cannula, at least a portion of the syringe barrel positioned such as to be visible through the at least one window;
• a drive assembly at least partially disposed within the body and operably coupled with the needle assembly to urge the medicament through the needle or cannula during an injection sequence;
• and
• an accessory, comprising:
• a base portion;
• a cylindrical shaped inner surface extending from the base portion along a longitudinal axis, the base portion configured to be operably coupled with the injector housing of the drug delivery device;
• a reflective surface extending from the cylindrical shaped inner surface and positioned with respect to the window such as to increase visibility of the syringe barrel, wherein:
• the reflective surface includes a reflector axis extending longitudinally within a plane of the reflective surface and intersecting the longitudinal axis at an angle between 15 and 75 degrees.