I had an episode of a sudden onset of white splotches in my vision and minor vertigo while working at a computer. It was much like when you have looked at a bright light then looked away. After a few minutes, it only affected one eye, then a few minutes later, only half of that eye's vision, and then it went away completely after about 20 mins. I also have had sudden and very brief episodes of vertigo/loss of balance which have been increasing in frequency for the last few weeks. No other neurological issues that I can recall. No numbness, or loss of sensation. Do you think these two symptoms are related, and how likely could they be precursers for a stroke or stroke-like event?