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Hello and thanks for your question. I can think of two possible things your doctor may have meant by that. Number one, there might be fluid accumulating underneath the central portion of the retina, causing it to detach centrally. This however would significantly impact the vision and therefore you probably wouldn't have waited a year to get this addressed. What has likely happened is that she has vitreous floaters. These floating spots or "black spots" are tiny pieces of the vitreous jelly that occupies a large amount of the volume of the back of the eye.
The floaters can take many different shapes which sometimes are as individual as the person having them. They can be screen-like, look like little gnats, in the shape of rings, spider-web like images as you are having or big clumps.
The most important thing to know about these floaters, besides the fact that they usually improve over time, is that uncommonly this process can lead to a break, hole, or tear in the retina, which can then lead to a retinal detachment, which can blind you. For this reason, it is important to see your ophthalmologist as soon as you can for a dilated eye exam to see if there are any problems with the retina. Four signs of a retinal detachment include: sudden increase in floaters, flashing or arcing lights that are persistent and not going away (not a few intermittent ones), a shade/shadow/spot in your vision that you can't see light through, or a large drop in your vision which doesn't improve after a few minutes. For any of these symptoms you must see an ophthalmologist as soon as possible.
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must be examined by your doctor.