steroid use and blindness

3 months ago I weened my 6 year old pug off VanectlyP, a combination antihistamine/steroid pill used to control allergies. She was taking it for 4 years. At first, she seemed lethargic and had a somewhat low heart rate, but this got better after a couple of weeks. Then, about a month later, I noticed some odd behaviour and I realized she was blind. I am certain she could see fine before we took her off the drug. My vet has ruled out glaucoma and pigmentation keratitis, and does not think the blindness is related to the steroid use or withdrawal. I am not so sure. I am wondering if she might have Addison's disease or Cushing's disease, which can be caused my prolonged steroid use. Blindnesss is listed as a "rare" symptom for both diseases. Her diet, bowel movements are all normal. Any ideas. She is currently off the steroids and is not receiving any treatment.

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