Huygens eyepiece(hÿ -gĕnz) See eyepiece.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
Huygens eyepiece[′hī·gənz ¦ī‚pēs]
An eyepiece in which there are two plano-convex lenses, and the plane sides of both lenses face the eye.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.