- A clear, jelly-like substance that fills the middle of the eye. Also called the vitreous humor, "humor" in medicine referring to a fluid (or semifluid) substance.
* * *- persistent anterior hyperplastic primary v. a unilateral congenital abnormality occurring in full-term infants; characterized by a retrolental fibrovascular membrane formed by persistent primary v. with remnants of the hyaloid artery and tunica vasculosa lentis; associated with leukokoria, microphthalmos, shallow anterior chamber, and elongated ciliary processes.- persistent posterior hyperplastic primary v. a unilateral congenital anomaly in full-term infants; associated with a congenital retinal fold and a v. membranous stalk containing remnants of the hyaloid artery.- primary v. the v. first formed in the embryo between the optic cup and the lens vesicle, and later vascularized by the hyaloid artery and its branches.- tertiary v. v. fibrils derived from the neuroepithelium of the ciliary body and forming the ciliary zonule.
* * *vit·re·ous 'vi-trē-əs adj of, relating to, constituting, or affecting the vitreous body <\vitreous hemorrhages>
* * *vit·re·ous (vitґre-əs) 1. glasslike or hyaline. 2. vitreous body (corpus vitreum [TA]).
Medical dictionary. 2011.