Optical adapters for wearable monitoring devices

An optical adapter for a wearable monitoring device, wherein the monitoring device comprises a housing having a portion with a biometric sensor that is wearably positionable adjacent the skin of a subject, wherein the biometric sensor includes an optical emitter and an optical detector, the optical adapter comprising:

• a base configured to be removably secured to the housing portion;
• a first light guide extending outwardly from the base that is in optical communication with the optical emitter when the base is secured to the housing portion, wherein the first light guide comprises a distal end that is configured to engage a portion of a body of the subject and to deliver light from the optical emitter directly into the body of the subject;
• a second light guide extending outwardly from the base that is in optical communication with the optical detector when the base is secured to the housing portion, wherein the second light guide comprises a distal end that is configured to engage a portion of the body of the subject, and wherein the second light guide is configured to collect light directly from the body of the subject via the distal end thereof and deliver collected light to the optical detector;
• and
• a plurality of stabilizing members extending outwardly from the base.