Optical physiological monitoring devices

An ear worn device, comprising:

• an optical source;
• an optical detector;
• and
• a housing supporting the optical source and optical detector, wherein the housing is configured to be positioned within an ear of a subject, wherein the housing comprises a first light guide in optical communication with the optical source and a second light guide in optical communication with the optical detector, wherein the first light guide comprises a distal end configured to deliver light from the optical source into the ear, wherein the second light guide comprises a distal end configured to collect light from the ear and deliver collected light to the optical detector, wherein the first and second light guides are angled relative to each other so as to be outwardly diverging and such that light rays emanating from the optical source and directed into the ear of the subject via the first light guide cannot overlap with light rays collected by the second light guide even when the housing is separated from the ear by a distance up to about three tenths of a centimeter (0.3 cm).

An ear worn device, comprising:

• an optical source;
• an optical detector;
• and
• a housing supporting the optical source and optical detector, wherein the housing is configured to be positioned within an ear of a subject, wherein the housing comprises a first light guide in optical communication with the optical source and a second light guide in optical communication with the optical detector, wherein the first light guide comprises a distal end configured to deliver light from the optical source into the ear, wherein the second light guide comprises a distal end configured to collect light from the ear and deliver collected light to the optical detector, wherein the first and second light guides define respective first and second axial directions, wherein the first and second axial directions are outwardly diverging, and wherein at least a portion of the distal end of one or both of the first and second light guides extends outwardly from the housing.