I can understand your concern.
No its not normal.
Do you have high blood pressure?
if yes, then are you taking medications on a regular basis?
Kindly consult a MD consultant physician in person for further evaluation and management.
You can also consult a neurologist.
Dr. Anil kumar jain.
You mean total loss (not seeing even light) or hazy vision. It is a serious affair . Loosing for 30 min is very long and recovery is poor. Was it in both the eyes or one eye .In any case get a thorough proper eye examination from an eye specialist MS. Also a Neuro he will refer you to as these are mostly from Neuro causes. A thorough systemic exam by MD physician is mandatory beside cause finding investigations to find out the cause and for specific treatment. Don't delay it can be serious.
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