A paramedic was left unable to see after being targeted with a laser pen near Carlisle.
The emergency worker had the beam shone into his eye while responding to a life-threatening incident on Friday, the BBC has reported.
He was left unable to read his tablet screen to update the patient’s medical records.
An unknown person shone the green laser pen at the paramedic and his colleague as he was getting out of the ambulance cab, the service said and the paramedic was unable to turn away in time.
Shortly afterwards his vision became blurred and he was taken to hospital for assessment. He was later given the all clear to resume his shift and his eye was not permanently damaged, the BBC said.