This image shows how floaters appear in the eye
What are floaters?
Floaters are small pieces of debris that ‘float’ in the vitreous humour of the eye. They occur behind the lens (the transparent window through which light enters the eye), and in front of the retina (the light sensitive tissue that lines the back of the eye).
Vitreous humour is a clear, jelly-like substance that fills the space in the middle of the eyeball. It is 99% water and 1% substances that help to maintain the shape of the vitreous.