Optics.
the ridge of the entrance pupil of an optical system, indicating the place where the pupil of the eye should be placed to view the object. Also called eye point .
Optics.
the ridge of the entrance pupil of an optical system, indicating the place where the pupil of the eye should be placed to view the object. Also called eye point .
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012