Perception through the eyes is considered as important in the work. If an error occurred may result in further loss of jobs and people. Therefore, To select personnel at work, needs to be checked before starting the job.
The perception through sight, it is important to work. If an error occurs, it may adversely affect the work and the people around you, so the selection of personnel to work need to check these before starting work.
Perceived through the eyes is important in your work. If crash up could result in lost work and people around you. So the selection of personnel come to check carefully before starting work.