Chapter 10 Vitreous
The vitreous is a gel composed of collagen fibrils, mucopolysaccharides, and water (98%). It is normally optically transparent. It maintains the shape of the eye and aids in keeping the retina opposed to the underlying layers. Pathologically it may be affected by changes associated with aging (asteroid hyalosis); liquefaction (syneresis), which often accompanies inflammation of the uvea and retina; degeneration; and the deposition of various chemical and cellular infiltrates (inflammatory and neoplastic cells), blood, or cholesterol (synchysis scintillans).
Figure 10-1 Persistent hyaloid remnant in an Old English sheepdog. The hyaloid artery supplies blood to the developing eye in utero. Around the time of birth, it normally atrophies and disappears. The hyaloid remnant in this figure remains attached axially to the posterior lens capsule. It is not patent.
(Courtesy Dr. E. Dan Wolf.)