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You do seem to be having a couple of issues here in the eye. The redness and itching must have been from allergic conjunctivitis which got relieved with the prescribed eye drops.
As for the pain in the back of the eye, a few more clarifications are needed. Apart from the pain in that eye , have you experienced any nausea or headache?
Is the vision reduced in the eye now?
When you said central retinal vein occlusion(CRVO), do you have any idea about which type it was diagnosed as- ischemic or non-ischemic? Did you have any residual visual deficit following the CRVO? Was the intraocular pressure within normal limits after CRVO was diagnosed?
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I have had headaches yes but no nausea. I am not sure which type of CRVO was diagnosed. I have had a visual problem since the diagnosis in that there is a blockage in certain areas when I am looking at something. I believe the pressure has been normal when I have gone to the Dr.
Considering all the facts given above, it can be said that your present eye ache is unlikely to be arising from the CRVO ( it being a painless condition). It is more likely to be from ocular migraine ( even though you do not have any previous history of similar episodes).
CRVO is known to cause delayed glaucoma( raised intraocular pressure) usually after 3 months, but again it is more of a painless condition( open angle glaucoma is seen here and is painless).
With the present symptoms it does seem that there is nothing very serious happening in the eye which would need urgent care. You can take Tab. Acetaminophen (tylenol) 500 mg , twice a day to relieve the eye ache.
okay, thank you.
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