Medical Definition of Ramsden eyepiece

1. An ocular consisting of two plano-convex lenses with the plane side of the lower lens nearer the objective. The focal plane is outside the system, hence it is of the positive type with the diaphragm below the lenses. While this eyepiece gives a somewhat flatter field than the Huygenian and for this reason has been used in the past for micrometre oculars, the colour correction is poor with the formation of colour fringes around the object. The modern Ramsden eyepiece has an achromatic doublet for the eye lens to correct for colour. (05 Aug 1998)



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Lexicographical Neighbors of Ramsden Eyepiece

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 (current term)
Ramses
Ramses II
Ramses the Great
Ramsey
Ramsey theory
Ramsgate
Ramsons
Ramstedt operation
Rana cascadae
Rana clamitans
Rana goliath
Rana palustris
Rana pipiens
Rana sylvatica

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