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2. Eyepiece - Wikipedia

   en.wikipedia.org/wiki/Eyepiece

   The lenses are called the eye lens and the field lens. The focal plane is located between the two lenses. It was invented by Christiaan Huygens in the late 1660s and was the first compound (multi-lens) eyepiece. [2] Huygens discovered that two air spaced lenses can be used to make an eyepiece with zero transverse chromatic aberration.

3. Lens (vertebrate anatomy) - Wikipedia

   en.wikipedia.org/wiki/Lens_(vertebrate_anatomy)

   The lens is located towards the front part of the vertebrate eye, called the anterior segment, which includes the cornea and iris positioned in front of the lens. The lens is held in place by the suspensory ligaments (Zonule of Zinn), [1] attaching the lens at its equator to the rest of the eye [2] [3] through the ciliary body.

4. Optics and vision - Wikipedia

   en.wikipedia.org/wiki/Optics_and_vision

   A corrective lens is a lens worn in front of the eye, mainly used to treat myopia, hyperopia, astigmatism, and presbyopia. The goal is to bring vision up to 20/20 vision or as close to this as possible. Glasses or "spectacles" are corrective lenses worn on the face a short distance in front of the eye.

5. Cardinal point (optics) - Wikipedia

   en.wikipedia.org/wiki/Cardinal_point_(optics)

   The optical center of a spherical lens is a point such that If a ray passes through it, then its lens-exiting angle with respect to the optical axis is not deviated from the lens-entering angle. In the right figure, [ 8 ] the points A and B are where parallel lines of radii of curvature R 1 and R 2 meet the lens surfaces.

6. Binoculars - Wikipedia

   en.wikipedia.org/wiki/Binoculars

   Internal focusing, which focuses binoculars by moving internal mounted optical lenses located between the objective lens group and the prism assembly – or rarely located between the prism assembly and eyepiece lens assembly [23] [38] – within the housing without changing the volume of the binoculars. The addition of a focusing lens reduces ...

7. Optical microscope - Wikipedia

   en.wikipedia.org/wiki/Optical_microscope

   The eyepiece, or ocular lens, is a cylinder containing two or more lenses; its function is to bring the image into focus for the eye. The eyepiece is inserted into the top end of the body tube. Eyepieces are interchangeable and many different eyepieces can be inserted with different degrees of magnification.