Yogi: When objects at the 5 sense doors are observed through the mind (awareness), they become blur, not as clear as observing the objects at the 5 sense doors.

Sayadaw: Because of concepts, the 5 sense doors become clear.

[Yogi’s note: When the mind targets being aware of seeing, seeing happens together with seeing outside things (concepts), for example; but when the mind targets observing the awareness of physical objects, concepts fade.]