The same problem occurs with some webcams that may have a still-picture snapshot function or button to trigger movie recording.
Simply touching the camera to enable it knocks it out of alignment - and focus.
USB Video Class - Universal USB webcams are now the de-facto camera standard, the SMART choice for getting online and connected to pals, family and friends with the least amount of hassle and cross-platform compatibility.
No driver install is required on modern computer operating systems.
Autofocus cams can be a double-edged sword: The can adapt to normal range or show close-ups without manual adjustment.