I have the same thing. I take antidepressant medication, do you. This just started happening to me within the past 2 weeks. I thought I might be going blind, thought it might be a Side effect of my meds, thought it was diabetes, now I think it's low blood pressure. If you find anything out, please update this.
You need to see an ophthalmologist or optometrist for an eye examination.
If you live in USA you can find an Eye MD near you at www.geteyesmart.org
JCH MD