Floaters What the hell is those floating worm-like things that we see while looking at sky. Those are called floaters. Its scientific name is 'muscae volitantes'. These are not the things outside of our eyes, in the sky or in the atmosphere they are because of something in our eyes. Then what is this floaters (muscae volitantes) This are just shadow formed bye some substance in our eye more precisely In our vitreous humour. Light versus through various medium of our eyes to reach the retina. In retina there is photosensitive cells which Makes our vision. Just in front of retina there is a jelly like medium called vitreous humour. When there is something in this vitreous humour while passing light through it makes a shadow in the retina. This shadow is our floaters. Substances in vitreous humour Tissue remnants RBC (red blood cells) Other blood cells When these are clearly seen This are clearly seen while looking at any single coloured medium,like