OD	Optic disc
OC	Optic cup
CNR	Contrast-to-noise ratio
IoU	Intersection over union
FSE	Four-side evaluation
TMUEH	Tianjin Medical University Eye Hospital
DR	Diabetic retinopathy
FOV	Field of view
PPA	Parapapillary atrophy
ROI	Region of interest
GT	Ground truth
HLSM	Hybrid level set model