Medical Definition of Annular illumination

1. The result of placing a stop in the first focal plane of the condenser to produce an illuminating cone of light with all the light flux near the surface of the cone. The central part of the cone will be dark. This arrangement is often used for a darkfield effect in low-power work by transmitted light. The condenser must be correctly focused and centreed. By reflected light, darkfield illumination is attained with an annular con-denser fitted around the objective for opaque objects. Annular illumination implies that the object is lighted from all sides. (05 Aug 1998)

Lexicographical Neighbors of Annular Illumination

annueler
annuelers
annuent
annuitant
annuitants
annuities
annuity
annuity in advance
annul
annular
annular cartilage
annular eclipse
annular eclipses
annular illumination (current term)
annular ligament
annular ligament of the radius
annular ligament of the stapes
annular ligaments of the trachea
annular lipid
annular pancreas
annular placenta
annular plexus
annular scleritis
annular scotoma
annular sphincter
annular staphyloma

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