Marking ( here with white pen marker) concentric lines from orbital rim towards the periphery.
Between 2 concentric lines , the distance is the width of a wooden tonguer.
A square is the space delimited between 2 ,, red,, lines and 2 ,,white,, linesĀ
In bigger squares, injections ( vectors+tensors) will be >0.05 ml to max 0.1 ml/injection .
In smaller squares, injections ( vectors+tensors) are 0.05ml/injection.