Dear Dr. Roach: My father is in his mid-60s and recently underwent surgery to repair mitral valve prolapse. Everything went smoothly, and his recovery has been good, with the exception of this morning. He has resumed smoking , and he experienced a dizzy spell where his vision in one eye became hazy, then gray, then black. His blood pressure was fairly high at this time. He sat down, and after several minutes, his vision slowly returned.
It is true that migraines can cause a temporary loss of vision. Since he has never had a migraine, this diagnosis is less likely. What makes it even less likely is that migraines almost always have visual changes, such as scintillations. Still, it could be possible that this is a migraine phenomenon, since they don’t always obey the “rules” written in textbooks.
If all testing comes out looking good, his doctor may have been right. Still, a stroke can cause permanent loss of brain function, and his risk is high enough that he’s doing himself a disservice if he does not get evaluated.
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