Fig. 4

Optical coherence tomography highlighting improvement of papilloedema. OCT is useful for monitoring of changes in papilloedema. a, Right eye infrared (IR) image of a swollen optic nerve. Note the Paton’s lines (circumferential lines) between 9 o’clock and 11 o’clock. b, Right eye IR image the nerve following a low calorie diet 6 weeks later. Note the tidemark changes of the extent of the previous oedema. c, Right eye cross-sectional image half way through the optic nerve head. Note the high line indicates the height of the swelling at diagnosis and the green volume reduction from the first scan to the most recent one (in this case 6 weeks). d, Left eye IR image of a swollen optic nerve. Note the difference between a and d, indicating asymmetric papilloedema with worse papilloedema in the left eye. e, Left eye IR image the nerve following a low calorie diet 6 weeks later. Note the tidemark changes of the extent of the previous oedema. f, Left eye cross-sectional image half way through the optic nerve head. Note the high line indicates the height of the swelling at diagnosis and the green volume reduction from the first scan to the most recent one (in this case 6 weeks)