Medical Definition of Contact illumination

1. Illumination of the eye by means of an instrument in contact with the cornea or bulbar conjunctiva. Critical illumination, the precise focusing of the light source directly upon the object being examined. Dark-field illumination, a procedure in which a black circular shield is used to block the majority of the vertically directed rays of light (e.g., the field is dark), and a circumferential, suitably angled, mirrored surface is used to direct the peripheral rays horizontally against the object, thereby reflecting the light vertically through the objective lens and along the optical axis; thus, the object is well illuminated in a contrasting dark background. Synonym: dark-ground illumination. (05 Mar 2000)

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Lexicographical Neighbors of Contact Illumination

contact-type dermatitis
contact action
contact allergy
contact area
contact arm
contact ball
contact ceptor
contact cheilitis
contact dermatitis
contact details
contact following
contact guidance
contact high
contact hypersensitivity
contact illumination (current term)
contact induced spreading
contact inhibition
contact inhibition of growth
contact inhibition of movement
contact inhibition of phagocytosis
contact juggling
contact language
contact lens
contact lens solutions
contact lenses
contact metamorphism
contact point
contact print
contact rate

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