I actually have this too. I just went in to a optical specialist/surgeon in a eyelab, twice now, and they threw a corneal map and retinal scan in. They didn't find anything. I had big black spots and now faces, letters, and straight lines look dented in, like they're warping and caving in on themselves. I have bad depth perception and feel off balance all of the time. After all the tests, they told me that it's ruled out being directly eye related and it's deeper inside the head. They can't find a single thing that looks abnormal, including eye pressure, and ruled out macular degeneration, retinal detachment, and glaucoma.
They said that the next step was that I needed to see a neurologist and ask for a MRI.
Unfortunately, I don't have insurance, and I have no access to a specialist like a neurologist or ability to pay for a MRI. I don't even have a primary care doctor and haven't since 1996, which was the last time I had insurance. All my other jobs were retail, so they shorted me in getting hours enough to qualify. I guess people like me just have to suffer and go for as long as we're able to keep going, until it gets worse, or something very bad happens. But if YOU have the ability to see a doctor or a specialist and go through the same thing with an eyedoctor and it comes up clean like mine did? Please, go see a neurologist as well! There might be a chance for you to have some answers and maybe a solution, if your eyedoctor doesn't find anything wrong.
That is a very serious symptom that often represents macular disease (reading part of the retina). Call an ophthalmologist today. Ask for an emergency exam. Find one near you at www.aao.org
JCH MD