There should be no need to measure, If the VAR official looking at the still picture does not see a reason to change the on field decision. This would make VAR decisions much speedier and more consistent to the roots of football that was down to the view of the officials at the time. To have to...
I entirely agree. Before VAR it was down to the linesman (assistant referee) to determine offside in his/her instant judgement. Therefore, surely the VAR check should be just on a visual check and unless it is an clearly a wrong decision, the onfield decision should be upheld.