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As you must be aware that coumadin ( warfarin) is an anti-coagulant and its major side effect is the risk of bleeding.
The risk of severe bleeding is however quite small and most often occurs due to alteration in dose.
Your hisband must have had a vitreous hemorrhage ( bleed into the vitreous which is a thick gel in the middle of the eye) which must have caused the sudden loss of vision.
But studies point out that anti-coagulants such as warfarin do not pose any higher risk for vitreous hemorrhage.
But if the ultrasound has revealed a hematoma outside the eyeball but compressing the optic nerve thus causing the sudden loss of vision then I guess early decompression of the optic nerve is needed by an orbitotomy.
However bruising of the arms could have been due to the side effect of coumadin( ? any change in the routine dose).
It is better to keep his physician updated about any new symptom so as to start treatment early.
The fact that he has had multiple bleeds ( forearm bruises and hematoma) , the risk of bleeds elsewhere cannot be ruled out. His physician must be consulted before any change in medicines is made. The advantages and disadvantages have to be weighed before any further decision is taken.
For the ocular issue he can continue the treatment suggested by the retina specialist if it is a vitreous hemorrhage or with an orbit and oculoplasty surgeon if there is a hematoma which needs an orbitotomy.
Please feel free to ask follow up questions if any.
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