Vitrectomy is a surgery to remove some or all of the vitreous humor from the eye.
Anterior vitrectomy involves the removal of small portions of the vitreous from the front structures of the eye - often because they are tangled in an intraocular lens or other structures.
Subtotal vitrectomy is a General term for a group of operations accomplished in the deeper part of the eye, each of which involves removing some or all of the vitreous - the eyes clear internal jelly.
Before the modern era, some surgeons performed vitrectomies raw. For example, a Dutch surgeon 1650-1692 Anton nuck said, removed the vitreous body by aspiration into a young man with sore eyes. In Boston, 1778-1856 John Collins Warren performed the crude society of vitrectomy for angle closure glaucoma.