I understand your concern. Your symptoms of heavy floaters and flashes
are typical of a posterior vitreous
detachment (what your optometrist described to you). Around your age, many people have the gel within their eyes get more liquid, similar to jello left out. It is a normal process. As it liquifies, it will pull away from you walls of you eyes. This happens to many people, but causes no symptoms at all.
In your case, the gel pulling away from the wall of your eyes is attached firmly to some parts of the retina, causing the "flashes". This puts you at risk for retinal tears, holes, and possibly retinal detachment
Because you are actively having symptoms, it is recommended that you get repeat dilated exam. You may ask your optometrist if he/she is comfortable with the exam, or refer you to a general ophthalmologist
or retina specialist. These exam should be covered under your medical insurance.
A vitreous detachment may take weeks to months for fully occur. During this time, you are at risk for retinal problems. If the floaters and flashes are stable and not increasing, my normal routine is to see patients a week later, then 1-2 weeks later, 1-2 months laters, then 4-6 months after that.
This is assuming that all the exams are normal. If you have an increase in flashes and/floaters, you need to call your doctor sooner, since there has been a change.
It is not necessary to have an MRI for your symptoms.
The blood pressure is not likely to related to your symptoms. Sometimes floaters are due to blood in the eye
, which and be related to your blood pressure. Your optometrist should have seen blood if there was any.
Hope this information was helpful.