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Your symptoms are quite typical of a scintillating scotoma in case of ocular migraine.
The very fact that these episodes last only for 15-20 minutes shows that they are not due to anything serious or concerned with the visual centres in the brain.
Migraine episodes last typically for half to one hour at the most.
In ocular migraine the visual symptoms are more prominent and headache may or maynot be associated with it.
I have no pain associated with these
Is there anything I can do to prevent/redusce their occurance?
Is there a dietary link with these?
Though the exact cause for these episodes are not known , there has been an assumption about a link between these and an intake of MSG(monosodium glutamate). Since you do not have any triggering factors prevention could be difficult .
I don't believe I have a high intake level of MSG is there anything else I might be able to add to my diet as a preventative?
Unfortunately there is no role for any particular food which can help in prevention of these episodes.
Since you do not have headache, there is no role for analgesics either.
Preventive medicines are available for those who suffer from migraine headaches( propranolol or Flunarizine).
Here is a small article on scintillating scotoma( with a list of most common triggering factors)-
Is there anything that may be inferred with the frequency of the episodes. While the duration of the episode seems constant the frequency has increased lately
If you could go through the above link and look for any particular triggering factor which is appilcable in your case, it would be very helpful.
Thank you for your assistance
It could be emotional or physical stress/noise/food/caffiene.