Medical Definition of Ramsden disk

1. The small circular patch of light that appears at the eyepoint above the ocular lens. This is the exit pupil of an optical instrument that, in a microscope adjusted for Koehler illumination, lies in a plane conjugate with the objective rear focal plane, condenser iris, and light source. Alteration of the Ramsden disk (for example, by the observer's iris) modifies the aperture function, diffraction pattern, and direction of view of the specimen. (05 Aug 1998)



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Lexicographical Neighbors of Ramsden Disk

Ramists
Ramman
Ramon Lully
Ramon y Cajal
Ramona
Ramos gin fizz
Ramphastidae
Ramphomicron
Ramsar
Ramsay
Ramsay Hunt
Ramsay Hunt's syndrome
Ramsay Hunt syndrome
Ramsden's ocular
Ramsden circle
Ramsden disk
Ramsden eyepiece
Ramses
Ramses II
Ramses the Great
Ramsey
Ramsey theory
Ramsgate
Ramsons
Ramstedt operation
Rana cascadae
Rana clamitans
Rana goliath
Rana palustris
Rana pipiens

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