Sixteen predictors were used in this analysis: vessel tortuosity (both mean and standard deviation (SD)), ABA, SD of angle, TBA, CRAE, CRVE
, AVR, FD (Binary Box-Counting dimension of skeletonized images), and VB plus the patient's demographic information (i.e., gender, age, systolic and diastolic blood pressure, Body Mass Index (BMI), and skin fold).
In a series of sensitivity analyses, we also adjusted for blood pressure (SBP, DBP) and HR in a subset of 59 participants and adjusted for fellow vessel diameter (i.e., for CRVE in models of CRAE, and vice versa).
Predictors and correlates of CRAE and CRVE. CRAE and CRVE averaged 136 [+ or -] 14 [micro]m and 189 [+ or -] 18 [micro]m, respectively.
Table 2 shows that the central retinal artery equivalent (CRAE), central retinal vein equivalent (CRVE), and arteriolar-to-venular diameter ratio (AVR) followed a normal distribution among the four groups.
The major parameters: central retinal artery equivalent (CRAE), central retinal vein equivalent (CRVE), and arteriolar-to-venular diameter ratio (AVR).
During the course of the study (January to May 2012), observed CRVE
did not change significantly, but decreases in CRAE were measured in association with higher exposures to coarse [PM.sub.10] and black carbon.
Linear regression analysis was used to measure potential correlations between factors such as age, IOP, refractive errors, mean deviation (MD), pattern standard deviation (PSD), CRAE, CRVE
, and RNFL thickness.
Following further developments in 1999 it was possible to calculate CRAE and CRVE
by measuring all vessels crossing through a concentric annulus around the ONH (see Figure 2).
(9) Measurement of haemodynamic characteristics (see Figure 2, page 67) includes: blood flow; oxygen saturation; vessel calibre (referred to as central retinal artery equivalent (CRAE) and central retinal vein equivalent (CRVE
)); vessel tortuosity; and the change of vessel diameter due to flicker light (referred to as vessel reactivity).
Central retinal artery equivalent (CRAE) and central retinal vein equivalent (CRVE
) diameters were estimated from the individual peripapillary vessel diameters according to the method of Knudtson et al.
The patients' general information, polysomnography, and fundus photography parameters including central retinal artery equivalent (CRAE), central retinal vein equivalent (CRVE
), and arteriole-to-venule ratio (AVR) were collected.