Vitreous body
Corpus vitreum · Sklivec
Sense organs
Looks like
The clear jelly filling the space behind the lens, making up most of the eyeball.
What it does
Holds the eye's shape and lets light pass to the retina.
Keeping it well
Floaters are common with age; a sudden shower of floaters, flashes or a curtain over vision can be a retinal tear and needs same-day care.