Taking into account only patients with unilateral cilioretinal arteries and performing an intraindividual intereye comparison, the eyes with cilioretinal arteries and the fellow eyes without cilioretinal arteries did not differ significantly in the total area of the neuroretinal rim, area of the neuroretinal rim in the four disc sectors, the ratio of temporal horizontal rim area to total rim area, and the ratio of temporal rim area to nasal rim area
(Table 2) . In a parallel manner, the eyes with cilioretinal arteries and the contralateral eyes without cilioretinal arteries did not vary significantly in the occurrence and area of beta zone of parapapillary atrophy, measured as a whole and separately in the four sectors, or in the ratio of the area of beta zone in the temporal horizontal sector to the total area of beta zone
(Table 2) .
In the interindividual and the intraindividual comparisons, mean visual field loss was slightly, but not significantly, larger in the eyes with a cilioretinal artery than in the eyes without a cilioretinal artery
(Tables 1 2) . These perimetric measurements were obtained at the baseline of the study when some of the participants were relatively inexperienced in perimetry. In an additional analysis, comparing visual field results of follow-up visits of participants who had undergone a minimum of three computerized perimetric examinations, the visual field parameters mean defect, corrected loss variance and mean defect of the central 10° no longer showed significant differences between eyes with cilioretinal arteries (
n = 20) and eyes without cilioretinal arteries (
n = 70) (
P > 0.70; Mann-Whitney test). Correspondingly, in the intraindividual intereye comparison of patients who had undergone at least three computerized visual field examinations (
n = 12), the perimetric parameters did not show significant differences between eyes with cilioretinal arteries and their respective fellow eyes without cilioretinal arteries (
P > 0.75; Wilcoxon signed rank test).