These are not blood cells. If these were blood cells, you would see them so frequently, it would be annoying. Those floaters you may get from standing up to fast, getting the wind knocked out of you, holding your breath, are the blood cells carrying oxygen to your brain to resuscitate. These things, however, have multiple variations. size, speed, glow, duration, luminosity, etc. some are even shadowy. it almost looks like a wisp of cigarette smoke. they are undoubtedly intelligent by nature and the more plausible reasoning makes most uneasy, so I wont go there. Lately, with the same kind of focus used for viewing these objects, or lack of focus required, i have additionally begun to see seemingly invisible things. i can see something move of deliberate and destinguishable actions without having a logical "scientific" explanation. examples being wind, temperature, moisture, pressure, seasonal circumstance. there isnt much relevance. in fact, sometimes every single one of them are moving at a muuuch slower rate compared to their typical speeding bullet sense of hurry. That really throws a veil over the entire question presuming there are other circumstance(s) which are not being accounted for and anticipated.
Back to these invisible gliders, they come and go from seemingly random locations not following any obvious logical consistency. They are weird to track and easy to lose. as another person said, i can track them until i move my pupil off of target. im learning to move my.focus while maintaining constant visual. some of these things are astronomically huge, frankly its terrifying but humbling.
For people who do not notice these yet, and would like to try/learn, i recommend buying a relatively cheap of polarized sunglasses. This cuts out a lot of that stupid glare of technicolor that is distracting and constantly waxing and waning. Be sure you're relatively calmed/relaxed. Do not allow the sun to be in much of your vision if any, peripheral included. but daytime is much easier. dont look around a lot, instead, kind of stare into nothingness similar to those illusion pictures where you gotta make your eyes go out of focus to see the 3d image, except, dont go fuzzy eyes. reseting your eyes and changing your pupils orientation with your line of view may reset what you were tracking. this becomes less and less after being familiar with the process, as in am now seemingly able to see cloaked or stratospheric crafts, and track the others longer and with incremental pupil orientated movement. ive only a few guesses what it all adds up to, most of which i would doubt people want to hear. im new here but hopefully ill remember to check back on this incase anyone has questions on the matter or would like to share/discuss