Hi. I'm online and happy to answer your question today. I see that your expert has opted out and is no longer available to assist you.
I am a retina specialist and, from what you have posted, the black floaters are nothing to worry about at this time.
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.
What can you do about the floaters? Well, floaters don't go away, and they don't really get worse. Over time they tend to "sink" out of your central vision and you brain "filters" them out so you don't notice them so much anymore. They almost never cause significant visual problems except, of course, if they cause a secondary retinal detachment as discussed above. The only way to decrease or remove the floaters is with a major surgery called a vitrectomy
. As a retinal specialist for almost 2 decades I've only done this procedure to remove floaters in a handful of cases.
What you are experiencing is not caused by eye strain.
Concerning your eye pressure, as DrDan stated, it is almost impossible for your pressure to get too low from the use of glaucoma drops so no worries there.
If you could give me more information about what is going on with your sisters eyes, I would be happy to help you to better understand her situation.
I hope this information was helpful for you. But I do work for tips so I want to make sure you are happy with me before rating me. If you have another question on this or a related issue feel free to fire away. And please let me know if the rating system gives you any troubles.
Thanks in advance,
Dr. Rick MD FACS