eyehole

Noun

 * 1) The hole to which the viewer places his or her eye in a device such as a telescope.
 * 2) The hole in a helmet, skull, etc. corresponding to the position of the eye.
 * 1) The hole in a helmet, skull, etc. corresponding to the position of the eye.

Translations

 * Catalan:
 * Finnish: silmänreikä
 * Russian: