| CPC A61B 3/14 (2013.01) [A61B 3/0008 (2013.01); A61B 3/0025 (2013.01); A61B 3/0041 (2013.01); A61B 3/113 (2013.01); A61B 3/12 (2013.01); A61B 5/117 (2013.01); A61B 5/1171 (2016.02); G02B 27/017 (2013.01); G02B 27/0172 (2013.01); G02C 11/10 (2013.01); G06F 3/013 (2013.01); G06F 21/10 (2013.01); G06F 21/32 (2013.01); G06V 40/19 (2022.01); G06V 40/193 (2022.01); G06V 40/197 (2022.01); G02B 2027/0138 (2013.01); G02B 2027/014 (2013.01); G02B 2027/0178 (2013.01); G02B 2027/0187 (2013.01)] | 20 Claims |

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1. A system comprising:
a wearable head device comprising:
an image light source;
one or more sensors; and
a partially reflective surface positioned to receive image light from the image light source; and
one or more processors configured to perform a method comprising:
determining an operation mode based on a signal received by the one or more sensors;
causing the image light source to present image light, via the partially reflective surface, toward a user of the wearable head device;
in accordance with a determination that the operation mode comprises a first operation mode, capturing, via the one or more sensors at a first rate, reflected light comprising a reflection of the presented image light;
in accordance with a determination that the operation mode comprises a second operation mode, capturing, via the one or more sensors at a second rate different from the first rate, reflected light comprising the reflection of the presented image light; and
monitoring a health of the user based on the captured reflected light.
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