stage 4 BC experiencing blurry vision

My 81 year old MIL was diagnoised in March--she has received 15 radiation treatments, using a fentanly patch, arimidex, & so far 1 zometa infusion. She also received ratiation to the hip and spine.Recently she's been getting blurry vision with slight pain. We took her to the ER where they did an extensive optomology exam with no findings. she also had an MRI of the brain which reported (1) reventricular matter ischemic changes, (2) 2 incidental para falcine meningiomas, (3) subtle lesion of the right sphenoid bone with associated epidural enchancement & minimal enchancement along the right postion margin of the right lateral rectus muscle

[Cleveland Clinic]

Dear fasw:  Without evaluation, it is impossible for us to comment or speculate on your MIL's blurry vision.  You will be best served by reviewing the results of the MRI with her doctor to discuss if any of these findings may be responsible for the vision or if any of her medications may contribute to this.