Function of vitreous body?

It's one of the many parts in your eye. It is the jelly like substance in your eye, as opposed to the aqueous body, which is very liquidy, like water.Source: We just covered this at school.

The vitreous is the transparent, colourless, gelatinous mass that fills the space between the lens of the eye and the retina lining the back of the eye.

aids in lubrication

To reduce friction between the bones. It also lubricates the joints and allows smooth movements.