Hello and thanks for your question.
Bilateral, simultaneous vision loss indicates a problem with the circulation to the posterior (back) portion of the brain and the brain stem. My recommendation would be to see your primary care doctor and report these symptoms because you will likely need some radiologic imaging tests to detect problems in the blood vessels that supply blood to this part of the brain. Abnormalities in these blood vessels can be life-threatening at the worst.
Does this make sense and does this help address your concerns?
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must be examined by your doctor.