Hello ,
You have done a full evaluation for glaucoma,which has turned out to be normal. Keep evaluating for glaucoma every 6 months.
Seeing flashes of light, and floaters, in an otherwise asymptomatic eye is mostly PVD..
These flashes and floaters will come down once the complete PVD occurs.
If you have a high myopia, or a family history,then early age PVD can happen.
Next Steps
in any case ,it's nothing to worry about, if there is no glaucoma. PVD treatment is to just let it be ,and keep following up.