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2. Fisheye lens - Wikipedia

   en.wikipedia.org/wiki/Fisheye_lens

   In a circular fisheye lens, the image circle is inscribed in the film or sensor area; in a diagonal ("full-frame") fisheye lens, the image circle is circumscribed around the film or sensor area. This implies that using a fisheye lens for a different format than it was intended for is easy (as opposed to a rectilinear lens), and may change its ...

3. Porro prism - Wikipedia

   en.wikipedia.org/wiki/Porro_prism

   Porro prisms are most often used in pairs, forming a double Porro prism. A second prism rotated 90° with respect to the first, is placed such that light will traverse both prisms. The net effect of the prism system is a beam parallel to but displaced from its original direction, with the image rotated 180°.

4. Nikon F2 - Wikipedia

   en.wikipedia.org/wiki/Nikon_F2

   Special purpose lenses included the Micro-Nikkors 55 mm f/3.5 and 55 mm f/2.8, Micro-Nikkor 105 mm f/4 for close-up "macro" photography, the Noct-Nikkor 58 mm f/1.2 for low light photography, the PC-Nikkor 28 mm f/3.5 shifting perspective control lens, the GN-Nikkor 45 mm f/2.8 for automatically setting the proper aperture for flash exposure ...

5. Cyclotropia - Wikipedia

   en.wikipedia.org/wiki/Cyclotropia

   Cyclotropia cannot be corrected with prism spectacles in the way other eye position disorders are corrected. [12] (Nonetheless two Dove prisms can be employed to rotate the visual field in experimental settings.) For cyclodeviations above 5 degrees, surgery has normally been recommended. [13]

6. Download, install, or uninstall AOL Desktop Gold - AOL Help

   help.aol.com/articles/aol-desktop-downloading...

   Learn how to download and install or uninstall the Desktop Gold software and if your computer meets the system requirements.

7. Refractive error - Wikipedia

   en.wikipedia.org/wiki/Refractive_error

   When refractive errors in children are not treated, the child may be at risk of developing ambylopia, where vision may remain permanently blurry. [30] Because young children typically do not complain of blurry vision, the American Academy of Pediatrics recommends that children have yearly vision screening starting at three years old so that unknown refractive errors or other ophthalmic ...