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2. Aspheric lens - Wikipedia

   en.wikipedia.org/wiki/Aspheric_lens

   While in principle aspheric surfaces can take a wide variety of forms, aspheric lenses are often designed with surfaces of the form = (+ (+)) + + +, [3]where the optic axis is presumed to lie in the z direction, and () is the sag—the z-component of the displacement of the surface from the vertex, at distance from the axis.

3. Objective (optics) - Wikipedia

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

   Several objective lenses on a microscope. Objective lenses of binoculars. In optical engineering, an objective is an optical element that gathers light from an object being observed and focuses the light rays from it to produce a real image of the object. Objectives can be a single lens or mirror, or combinations of several optical elements.

4. Helios (lens brand) - Wikipedia

   en.wikipedia.org/wiki/Helios_(lens_brand)

   In 1972, the director of KMZ issued an order to increase the production of Helios-44-2 lenses in Valdai. The lens received a slightly modified lens block, the rear set of lenses was no longer twisted by the block and the lenses simply poured. The serial number was transferred to the lens body. In this form, the lens was assembled until the ...

5. Spherical aberration - Wikipedia

   en.wikipedia.org/wiki/Spherical_aberration

   Spherical aberration can be eliminated by making lenses with an aspheric surface. Descartes showed that lenses whose surfaces are well-chosen Cartesian ovals (revolved around the central symmetry axis) can perfectly image light from a point on the axis or from infinity in the direction of the axis. Such a design yields completely aberration ...

6. Anisometropia - Wikipedia

   en.wikipedia.org/wiki/Anisometropia

   The usual recommendation for those needing iseikonic correction is to wear contact lenses. The effect of vertex distance is removed and the effect of center thickness is also almost removed, meaning there is minimal and likely unnoticeable image size difference. This is a good solution for those who can tolerate contact lenses.

7. Luneburg lens - Wikipedia

   en.wikipedia.org/wiki/Luneburg_lens

   A Luneburg lens converts a point source into a collimated beam when the source is placed at its edge.. Each point on the surface of an ideal Luneburg lens is the focal point for parallel radiation incident on the opposite side.