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Long term vitreous traction (stretching) of the retina is thought to be what is associated with the increased risk of tears to the retina or retinal detachment. [1] Under a microscope looking at the histology of a cystic retinal tuft, an increase in glial cells, breaking down of the outer retina, and a loss in photoreceptor cells is often ...
PVR is graded as Grade A, B, or C by the Silicone Oil Study and as Grade A, B, C, or D by the Retina Society Terminology Committee. [10] Grade A is characterized by the appearance of vitreous haze and RPE cells in the vitreous. Grade B is characterized by wrinkling of the edges of the retinal tear or the inner retinal surface.
Diagram of the eye highlighting the retina, vitreous humor, and other key structures. The retina is a thin layer of tissue located at the back of the eye. [1] [5] It processes visual information and transmits it to the brain. [5] Retinal detachment occurs when the retina separates from the layers underneath it. [2]
A posterior vitreous detachment (PVD) is a condition of the eye in which the vitreous membrane separates from the retina. [1] It refers to the separation of the posterior hyaloid membrane from the retina anywhere posterior to the vitreous base (a 3–4 mm wide attachment to the ora serrata).
Vitreomacular adhesion (VMA) is a human medical condition where the vitreous gel (or simply vitreous, AKA vitreous humour) of the human eye adheres to the retina in an abnormally strong manner. As the eye ages, it is common for the vitreous to separate from the retina.
The internal limiting membrane, or inner limiting membrane, is the boundary between the retina and the vitreous body, formed by astrocytes and the end feet of Müller cells. It is separated from the vitreous body by a basal lamina.
The posterior segment or posterior cavity [1] is the back two-thirds of the eye that includes the anterior hyaloid membrane and all of the optical structures behind it: the vitreous humor, retina, choroid, and optic nerve. [2]
The vitreous base is an area in the fundus of the eye in which the vitreous membrane, neural retina, and pigment epithelium all are firmly adherent, one to the other. The vitreous membrane is more firmly attached to the retina anteriorly at the vitreous base. The vitreous membrane does not normally detach from the vitreous base, although it can ...