In the second stage of anaesthesia the pupil is –
Stage 1 → Pupil size normal
Stage 2 → Partially dilated
Stage 3 → Plane 1 → normal size, Plane 2 → 1/2 dilated, Plane 3 → 3/4 dilated, Plane 4 → fully dilated.
Stage 4 → Fully dilated & fixed
Constricted
Partially dilated
Normal in size
Totally dilated