The vitreous body (vitreous meaning "glass-like"; from Latin vitreus 'glassy', from vitrum 'glass', and -eus) is the clear gel that fills the space between the lens and the retina of the eyeball (the vitreous chamber) in humans and other vertebrates. It is often referred to as the vitreous humor (also spelled humour), from Latin meaning liquid, or simply "the vitreous". Vitreous fluid or "liquid vitreous" is the liquid component of the vitreous gel, found after a vitreous detachment. It is not to be confused with the aqueous humor, the other fluid in the eye that is found between the cornea and lens. 

In the present book, fifteen typical literatures about vitrectomy published on international authoritative journals were selected to introduce the worldwide newest progress, which contains reviews or original researches on vitrectomy. We hope this book can demonstrate advances in vitrectomy as well as give references to the researchers, students and other related people.