Peripapillary retinal nerve fiber layer thickness and peripheral microcirculation in Raynaud's disease.

Abstract

Introduction: Normal-tension glaucoma has been associated with systemic vascular diseases such as peripheral vasospasm. This study aims to evaluate the influence of peripheral vasospasm on the thickness of the retinal nerve fiber layer (RNFL) in Raynaud’s disease (RD), and the correlation between global RNFL and peripheral microcirculation features in RD patients. Methods: Observational cross-sectional study of 18 patients (35 eyes) with a diagnosis of RD followed in our clinic, and 20 healthy controls (39 eyes). RNFL parameters were obtained using spectral domain optical coherence tomography (SD-OCT Spectralisâ, Heidelberg). Global and sectorial peripapillary RNFL thickness were registered. Age, gender, refractive error, best-corrected visual acuity and intraocular pressure were determined, and slit-lamp biomicroscopy and fundus examination were performed. Nailfold videocapillaroscopy (NC) was performed in the RD group to characterize capillary morphology and blood flow. Mann-Whitney and Fisher’s exact tests were used for statistical analysis. Statistical significance level was set at p<0.05 (two-sided). Results: There was no significant difference in the global RNFL between RD patients and the control group (p=0.35). The presence of avascular areas in NC was associated with a lower global RNFL thickness (p=0.026). Conclusion: The association between avascular areas in NC and the lower global RNFL thickness in RD patients suggests that systemic vasospasm severity may be related to optic nerve lesion propensity. Therefore, its presence in NC may identify RD patients at risk for optic nerve head lesion. A larger sample with a long-term study is needed to support the clinical and therapeutic implications of our findings.