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Answers: Do they appear as shadow-like squiggly lines or specks? Sometimes, near old age, relations can get something call "Floaters" caused by shrinkage of the vitreous of the eye. It's usual with elder age (although not everyone gets this) and usually go away by eventually settling at the bottom of the eye. But - if you have a sudden increase within them or find that you've lost your peripheral illusion, then it could plan retinal detachment (which requires emergent care).
I hope this helps. =)
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