What Causes Black Spots In The Line Of Vision When Diagnosed With Migraine Headache?
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Detailed Answer:
I read your question carefully and I understand your concern.
The fact that the spot disappears is heartening because it is against neurological causes in which case the loss of vision would be persistent and repeatedly improve spontaneously. The same fact applies to some eye conditions such as macular degeneration (common with age) which would also be persistent.
So the most likely explanation would be a type of migrainous aura, which can manifest even in the absence of headache. The other possibility would be your retina having difficulties adaptin to change from darkness to light (but I would still put migraine as more likely as in that case it shouldn't be on the same spot on both eyes).
For the moment I wouldn't say any intervention is necessary, only if the episodes are not transitory but become permanent, or if there appear other symptoms such as flashes of light, permanent cobwebs in your eyesight etc would a visit from an eye specialist become necessary.
I remain at your disposal for other questions.