this post was submitted on 29 Aug 2024
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Bright flashes usually indicate a tear. Small ones can just be monitored but if you see a big flash (it'll be sort of like lightning) and there is no environmental cause, it is an emergency. If you don't get it repaired, you could go blind. This isn't medical advice, just what I was told when I was younger. This article is basically WebMD quality, but gives a little more on what to look for.
https://my.clevelandclinic.org/health/diseases/25107-retinal-tear
oh wow! how could I have gotten a tear??
You didn't. If you get a retinal tear and then don't get treatment you'll end up with permanent vision loss. It's a major medical emergency. If all you had was a flash and nothing else, it wasn't a retinal tear.
Your doctors might be concerned about retinal detachment which can be just as serious though. If they think you're a high risk for it it's worth getting anything abnormal checked out.
There are many causes, so possibly nothing you'd even be aware of.