HRV	Heart rate variability
APG	Acceleration plethysmography
ANS	Autonomic nervous system
CCI	Charlson Comorbidity Index
ACCI	Age-adjusted Charlson Comorbidity Index
SDNN	The standard deviation of normal-to-normal intervals
RMSSD	The square root of the mean of the sum of the squared differences between adjacent normal-to-normal intervals
CVRR	The coefficient of variation in R-R intervals
TP	Total power
VLF	Very-low-frequency
LF	Low-frequency
HF	High-frequency
PG	Primary open-angle glaucoma
EG	Exfoliation glaucoma
IOP	Intraocular pressure
OPP	Ocular perfusion pressure
BMI	Body mass index
BP	Blood pressure
CI	Confidence interval
XFS	Exfoliation syndrome
PEM	Pseudoexfoliation material
MD	Mean deviation