Clinical Methods of Vitreous Examination
Vitreous examination is of particular value in describing the vitreous changes in a large number of vitreoretinal disorders and in demonstrating the role of the vitreous in their pathogenesis and prognosis. Because of its relative transparency and low reflectivity, the vitreous is a difficult structure to study. Vitreous examination by optical means is based mainly on observation of the Tyndall phenomenon, which is caused by the scattering of light by particles in transparent media. This examination must be carried out in an optical section using a well-focused slit beam. Vitreous studies are performed with a slit lamp biomicroscope and a precorneal lens. The lens should cause minimal distortion and glare, and should provide a large field of view. The light should form a sharp and bright slit, and make as large an angle as possible with the biomicroscope. Full mydriasis and clear ocular media are also of prime importance for adequate vitreous examination.
KeywordsCystoid Macular Edema Vitreous Cavity Posterior Vitreous Detachment Tractional Retinal Detachment Vitreous Cortex
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