We are tanned because of UV exposure when we go out into the sunlight. Can you tan at home? No. Can you get sunburnt at home? No!
Similarly, UV light is only dangerous when we are exposed to it. It is a light electromagnetic wave! UVAs and UVBs have much higher penetrative power than UVCs.
UVC light does not pass through the lens of the eye. So do not worry about accidental exposure.