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Symptoms
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Abrupt loss of peripheral vision
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In some cases loss of central vision
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Permanent sectoral visual field defect.
Causes
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Pressure on vein by on athero sclerotic retinal artery
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Hypertension and diabetes mellitus are common predisposing factors
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Hyper viscosity of blood as inpolycythemia, hyperlipidemia, macroglobulinemia, leukemia, multiple myeloma, Cryoglobulinemia.
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Periphlebitis Retinae – associated with sarcoidosis, syphilis, SLE.
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Raised Intraocular pressure
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Local causes : Orbital Cellulitis, orbital tumors, facial erysipelas,Cavernous sinus thrombosis
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