what is the lense in the eyepiece of a microscope called?

I thought it was just called a lens. However, since this is not my area of expertise, I searched Google under the key words "microscope parts eyepiece" to get these possible sources:

http://www.microimaging.ca/microscope%20parts.htm
http://www.microscope-microscope.org/basic/microscope-parts.htm
http://brunelleschi.imss.fi.it/museum/esim.asp?c=201401
http://www.microscopeworld.com/MSWorld/parts.aspx

I hope this helps. Thanks for asking.