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Do you mean to say that you have floaters?
So it is fixed in your visual field and is visualised in the same spot each time you blink? It does not float all around, right?
It could be due to some tear film abnormality in that case.
Because dark spots can be either fixed or floating. If they float then they are most often due to vitreous changes or retinal problems. If they are fixed and do not clear up with each blink then they are scotomas and are seen in optic nerve problems. But in your case though they are fixed, they clear up with each blink, hence the probability of tear film abnormality.
Yes as in dry eyes.
Yes, artificial tears are beneficial in case of mild to moderate dry eyes. You can use over the counter, preservative free lubricating eye drops such as Refresh tears, 1 drop 4 times a day for a month.