Some people notice from time to time transparent lines in front of their eyes that look like worms, especially when looking at a clear sky or a white surface. These fuzzy data sometimes cause anxiety: what is it and is it a sign of disease? Let's understand why such visual phenomena occur, whether they are dangerous and in which cases you should consult an ophthalmologist. link not working? Try it, from Belarus - with a VPN. Download our app for Android or iOS.