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You are likely experiencing a PVD or posterior vitreous detachment, a common event that happens in many people. You have a thick gel material in the middle of your eyes called the vitreous. Over time as it liquefies, this gel material collapses on itself, forms little clumps that you can see as dots, lines or bugs. As these clumps form the vitreous pulls away from the wall of the eye. In the process it can stimulate the retina -- causing the flashes that you may see. It is recommended that you see your ophthalmologist to look at the retina to make sure there are no problems such as a retinal hole or tear. In most cases, there are no problems, but this exam is precautionary and allows for preventative treatment of any lesions that are found. If you notice a sudden increase in floaters, flashes of light (like a lightning storm), or a shadow/veil in the periphery of your vision, this can be worrisome for a retinal detachment. You would need to contact your ophthalmologist promptly in that case.
And, no, there is really nothing you can do to get rid of the floaters. Well, yes. You could have a vitrectomy (a major eye surgery) but the risks are not worth it.....not even close.
As far as the after images? Really nothing to do there, other then don't look at the tv or the blinds so hard. I'm not trying to be funny....it's just that there really isn't any good treatment for this stuff.
Since you've lived longer then 40 years, you are gonna have problems focusing on near objects. Use readers or bifocals.
If you are still having a lot of problems I suggest you have a complete eye examination by an ophthalmologist to make sure that there are no treatable conditions contributing to your symptoms.
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I don't have flashes of light. What happens is that I look at something and the image is still there when I look away. My eye doctor looked into my eye and could see every vein,and tne macular. There were no tears or holes that he could see.
I already wear transitional bi-focals.
So, this is something I have to just get used to?