Rams·den eyepiece
| \ ˈramz-dən-
\
\
Medical Definition of Ramsden eyepiece
: a nearly achromatic optical system that contains two plano-convex lenses with the convex surfaces facing each other and is used especially in instruments fitted with micrometer wires or a scale
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“Ramsden eyepiece.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Ramsden%20eyepiece. Accessed 30 Jun. 2022.
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