(ramz'dĕn), an eyepiece of a microscope, consisting of two planoconvex lenses with convexities turned to each other.
Ramsden,
Jesse, English optician, 1735-1800. Ramsden eyepieceRamsden ocular - an eyepiece of a microscope, consisting of two planoconvex lenses with convexities turned to each other.