The vitreous

image of The vitreous
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The vitreous humour is a transparent hydrogel that occupies the posterior segment of the globe. Its function is not only to act as a clear medium for transmission of light between the lens and retina, but its viscoelastic properties also provide mechanical support and protection for the internal structures of the eye during movement and deformation of the globe. This chapters covers embryology, anatomy and physiology; canine and feline conditions; vitreal interventions.

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17.1 Globe and vitreous. 1 = vitreous base; 2 = anterior hyaloid face; 3 = hyaloideocapsular ligament; 4 = attachment to margin of optic nerve head; 5 = cortical vitreous; 6 = lamellae and tracts; 7 = Cloquet’s canal; 8 = hyaloid vessel remnant; 9 = Mittendorf’s dot.
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17.2 Small hyaloid remnant on the posterior lens capsule.
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17.3 Fine opacities on the posterior lens capsule (Grade 1 PHTVL/PHPV).
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17.4 PHTVL/PHPV showing intralenticular haemorrhage and early cataract formation. (Courtesy of S Crispin)
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17.5 PHTVL/PHPV showing extensive cataract formation following intralenticular haemorrhage. (Courtesy of P Renwick)
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17.6 Typical fibrovascular plaque on the posterior lens capsule in a Staffordshire Bull Terrier with PHTVL/PHPV.
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17.7 Asteroid hyalosis in a 3-year-old German Shepherd Dog. (Courtesy of P Renwick)
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17.8 Asteroid hyalosis shown by slit-lamp examination in an 11-year-old crossbred dog.
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17.9 Synchysis scintillans in a crossbred dog. (Courtesy of S Crispin)
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17.10 Keel-boat-shaped preretinal haemorrhage in a dog.
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17.11 Small intravitreal haemorrhage in a 6-week-old Border Collie. (Courtesy of P Renwick)
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17.12 Vitreal haemorrhage and vitreoretinal traction band formation with a persistent hyaloid artery in a 1-year-old Welsh Terrier.
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17.13 Small pigmented cyst within the vitreous. (Courtesy of the Animal Health Trust)
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17.14 Intraocular larval migrans in a 5-year-old Staffordshire Bull Terrier bitch. (Reproduced from with permission from )
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17.15 Degenerative vitreous within the pupil of a 5-year-old Jack Russell Terrier caused by lens zonule breakdown.
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17.16 Pars planitis in a cat with feline immunodeficiency virus infection. (Courtesy of S Crispin)
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17.17 Retinal and vitreal haemorrhage in a cat with systemic hypertensive disease. (Courtesy of S Crispin)
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