You might have noticed some strange little worm like things floating aimlessly in your field of vision. These annoying squishy little lines are known as 'floaters' and about 70% of the human population experiences them. Eye floaters can appear as black or gray dots, lines, cobwebs or blobs and while they might be a nuisance, eye floaters do not cause you any pain or discomfort. Most floaters are small and quickly move out of your field of vision.
And now when you are sure that these floaters are not a sign of alien invasion, let us try to learn more about them.
Images via TED Ed
You'll notice that they move as your eyes move and appear to zoom across your eye as you try to look at them directly.
The correct term is muscae volitantes, Latin for Flying Flies. But don't worry. They are not flies, bugs or any living thing at all.
Red blood cells absorb blue light, effectively casting a shadow on the retina and this effect is known as the "blue field entoptic phenomenon". Meet the culprit behind those strange floaters!