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Contact illumination

Contact illumination

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.

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hear the spring peepers-endangered

... that the frogs are infected by the spores when their skin comes into contact with the infected water. The fungus is also thought to invade the ... transmitted light microscope. Some utilizing "circular oblique illumination or COL as we call it. All images are at 7 megapixel, except ...

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by Ken Ramos
Tue Feb 14, 2006 2:18 am
Forum: Ecology
Topic: hear the spring peepers-endangered
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