Ocular and Systemic Risk Factors and Clinical Implications in Glaucoma Patients with Retinal Vein Occlusion.

Prcis: Ocular factors such as worse visual acuity, increased optic disc cupping, and peak IOP-commonly associated with advanced glaucoma-have been identified as risk factors for concurrent RVO in glaucoma.

Purpose: This study aimed to identify ocular and systemic factors associated with concurrent retinal vein occlusion (RVO) in glaucoma and to examine their clinical significance.

Patients and methods: This retrospective study analyzed glaucoma patients with RVO, which was compared to a matched control group of glaucoma without RVO. Various ocular and systemic factors were identified as increasing the risk of RVO. RVO subgroup analyses were performed in central retinal vein occlusion (CRVO) and branch retinal vein occlusion. The RVO group was then categorized into Correspondence and Non-correspondence groups based on the synchronicity of RVO location and glaucomatous defect.

Results: A total of 86 eyes in the RVO group and 70 eyes in the control group were included. Multivariate analysis identified significant risk factors for RVO, including worse visual acuity (VA) (HR=4.887, P=0.011), higher peak intraocular pressure (IOP) (HR=4.140, P=0.005), and increased vertical cup-to-disc ratio (CDR) (HR=3.061, P=0.020). Subgroup analysis revealed that higher peak IOP (P=0.030) and lower peripapillary retinal nerve fiber layer thickness (P=0.019) were associated with CRVO. In the RVO group, 68.6% were categorized into the Correspondence group, of which the ocular and systemic profiles were similar to the Non-correspondence group.

Conclusion: These findings suggest that glaucoma and RVO may share common pathophysiologic mechanisms, with elevated IOP potentially contributing to the development of RVO. The majority of RVO location in glaucoma were synchronous with existing glaucomatous defects, which highlights the need for regular fundus examinations in high-risk individuals.