Kasima gave you good advice, you should heed it. You may very well have parasites AND something else wrong with your vision. Do not f*kc with your eyesight! It's not worth it!
Have you gone to an ophthalmologist? If your vision is worsening, you need to make an appt with one asap and DO NOT MENTION parasites to the ophthalmologist. Let them do their thing and look in your eyes properly, with the correct equipment and you need to listen to them. An ophthalmologist is not a general practitioner. If your vision is messed up due to parasites or a detached retina or whatever, they will know it and will treat for it properly.
Vision problems and parasites are not mutually inclusive. You could have something going on with your eyes that is completely unrelated to parasites. Be smart. Don't lose sight of what's really at stake here. Yes, that pun was intended.
If you dismiss this piece of advice as well, then I'm calling bullshit on everything you've said so far and won't believe you have a vision problem at all. As someone who once woke up blind in one eye inexplicably, I know what I'm talking about! Never seen a team of ophthalmologists jump on a case so fast! If you are truly losing your eyesight, you would get to a real eye doctor yesterday.