Medical Definition of Bertrand lens

1. A small, low-power lens, usually on a slide for insertion into the drawtube between analyser and ocular. It is used to observe the back focal plane of the objective so as to examine interference figures or as an aid in achieving interference figures. It is apt to be strongly astigmatic. It is used to image the lamp filament in setting up Kohler illumination as well as for centreing dispersion staining stops to the substage aperture diaphragm. (05 Aug 1998)



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Lexicographical Neighbors of Bertrand Lens

Bertholletia
Bertholletia excelsa
Bertie
Bertillon
Bertillon system
Bertin's bones
Bertin's columns
Bertin's ligament
Bertin's ossicles
Bertolt Brecht
Bertolucci
Bertram
Bertrand-Chebyshev theorem
Bertrand Arthur William Russell
Bertrand Russell
Bertrand lens (current term)
Berwick
Berwick-upon-Tweed
Berycomorphi
Beryl
Berzelian
Berzelius
Besançon
Besht
Besnier's prurigo
Besnier-Boeck-Schaumann disease
Besnier-Boeck-Schaumann syndrome
Besnoitia
Besnoitia bennetti
Besnoitia besnoiti

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