Diffuse illumination - Main purpose is to examine the eye for general observation, Direct focal illumination - Main purpose is to view the anterior segment of the eye, 3 different type of direct focal illumination are - narrow beam (optic section),parallelepiped and broad beam , Optic section - to determine the depth or elevation of cornea, conjunctiva and crystalline lens, Parallelepiped - to scan the cornea with varied level of magnification and brightness, Retroillumination - is technique used to examine the anterior structure while the light focus on the deeper structure , Conical beam - to detect particles in aqueous humor, Sclerotic scatter - to determine the clarity of the cornea, Specular reflection - to examine the integrity of corneal surface, Tangential - to determine the iris surface,

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