The pupil controls how much light enters the eye, allowing for clear vision. In low light, pupils widen to let in more light, and in bright light, they narrow to prevent too much light from entering.

Ane-Kristine Finbråten, specialty registrar in infectious diseases and senior researcher. She is a Harkness fellow in Health Care Policy and Practice 2021–22 at the Department of Population Health ...

ECU tendonitis can cause wrist pain and swelling, and may not have a clear cause. ECU snapping or subluxation can cause the tendon to move out of its groove and cause snapping sounds. ECU tendon ...