eyepoint

English

Etymology

eye +‎ point

Noun

eyepoint (plural eyepoints)

1. A point of reference based on the participant's focus, used in generating visual imagery in virtual reality systems.
   • 1991, Hewlett-Packard Company, HP-PHIGS graphics techniques: HP 9000 computers:

     When using specular reflection with smooth shading, HP-PHIGS needs to determine the position of the viewer, or eyepoint.

   • 2001, Woodrow Barfield, Thomas Caudell, Fundamentals of Wearable Computers and Augmented Reality, →ISBN:

     Another source of registration error is viewing error, which is the error in the modeled eyepoint locations.

   • 2005, Alfred T. Lee, Flight simulation: virtual environments in aviation, page 22:

     A single eyepoint for each display system is typical since binocular or stereoscopic display systems are very rarely used in flight simulators.

   • 2012, Robert Shannon, Applied Optics and Optical Engineering - Volume 9, →ISBN, page 267:

     In order to determine visibility of an object, its location relative to the pilot's eyepoint must be specified.

2. The focal point of an optical lens.
   • 1958, Émile Monnin Chamot, Clyde Walter Mason, Handbook of chemical microscopy, page 31:

     The height of the eyepoint depends on the focal length of the eyepiece and the position of its upper equivalent plane.

   • 1972 August, James R. Gregg, “How To See Better With Binoculars”, in Field & Stream, volume 77, number 4, page 114:

     You can locate the eyepoint by directing a pair of binoculars at a bright object while you hold a piece of waxed paper just back of the eyepiece. Move the paper in or out until the images are brightest and sharpest. This is the eyepoint, usually about half an inch (13 millimters) back of the surface of the ocular lens.

   • 2012, J. James, H.J Tanke, Biomedical Light Microscopy, →ISBN, page 16:

     All the rays leaving the eyepiece intersect at the eyepoint or exit pupil (also called Ramsden circle), and it is to this point that the observer's pupil should be brought in order to oversee the entire field of view. The height of the eyepoint diminishes with increasing eyepiece magnification, while its diameter remains fairly constant at 1-1.5 mm.