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Title	Occlusive versus non occlusive retinal vasculitis: A retrospective comparative study among 409 eyes in a referral center in Tunisia North Africa

Purpose	To compare clinical features, etiologies visual outcomes and prognosis among patients diagnosed with occlusive versus non-occlusive retinal vasculitis (RV).
Methods	A monocentric retrospective comparative study. Among the 284 patients screened 123 patients were diagnosed with occlusive RV (ORV) and 161 patients were diagnosed with non-occlusive RV (NORV).
Results	Mean initial BCVA was 20/63 in the ORV group and 20/50 in the NORV group. common clinical findings were vitritis (92.6% vs 95.1) vascular sheathing (63% vs 32%) intraretinal hemorrhages (58% vs 8.6%) anterior chamber inflammation (44.4% vs 54.3) and retino-choroidal lesions (36.1% vs 35.7%). RV most commonly affected retinal veins in both groups. Most common etiologies were Behçet’s disease (32.5% vs 18.6%) tuberculosis (20.3% vs 5%) and sarcoidosis (3.3% vs 14.9%). Most common complications included macular edema (41.5% vs 38.4%) and posterior segment neovascularization (22.2% vs 4.04%).
Conclusion	In this series ORV and NORV have distinctive clinical characteristics etiological profile and outcome and prognosis.
Conflict of interest	No

Authors 1

Last name	BEN AMOR
Initials of first name(s)	H
Department	Department of Ophthalmology Fattouma Bourguiba University Hospital
City	monastir
Country	Tunisia

Authors 2

Last name	hadj amor
Initials of first name(s)	W
Department	Department of Ophthalmology Fattouma Bourguiba University Hospital
City	monastir
Country	Tunisia

Authors 3

Last name	karray
Initials of first name(s)	D
Department	Department of Ophthalmology Fattouma Bourguiba University Hospital
City	monastir
Country	Tunisia

Authors 4

Last name	harzallah
Initials of first name(s)	W
Department	Department of Ophthalmology Fattouma Bourguiba University Hospital
City	monastir
Country	Tunisia

Authors 5

Last name	khochtali
Initials of first name(s)	S
Department	Department of Ophthalmology Fattouma Bourguiba University Hospital
City	monastir
Country	Tunisia

Authors 6

Last name	kairallah
Initials of first name(s)	M
Department	Department of Ophthalmology Fattouma Bourguiba University Hospital
City	monastir
Country	Tunisia