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2. How the West Was Won (film) - Wikipedia

   en.wikipedia.org/wiki/How_the_West_Was_Won_(film)

   Box office. $50 million. How the West Was Won is a 1962 American epic Western film directed by Henry Hathaway (who directs three out of the five chapters involving the same family), John Ford and George Marshall, produced by Bernard Smith, written by James R. Webb, and narrated by Spencer Tracy.

3. Zenni Optical - Wikipedia

   en.wikipedia.org/wiki/Zenni_Optical

   Website. www .zennioptical .com. Zenni Optical (formerly 19dollareyeglasses.com) is an American online retailer of prescription glasses and sunglasses. Founded in 2003 by Tibor Laczay and Julia Zhen, it is based in Novato, California . The company sells more than 2,000 types of prescription glasses and sunglasses but does not sell contact lenses.

4. Doublet (lens) - Wikipedia

   en.wikipedia.org/wiki/Doublet_(lens)

   In optics, a doublet is a type of lens made up of two simple lenses paired together. Such an arrangement allows more optical surfaces, thicknesses, and formulations, especially as the space between lenses may be considered an "element". With additional degrees of freedom, optical designers have more latitude to correct more optical aberrations ...

5. Effects of long-term contact lens wear on the cornea - Wikipedia

   en.wikipedia.org/wiki/Effects_of_long-term...

   Long-term contact lens use can lead to alterations in corneal thickness, stromal thickness, curvature, corneal sensitivity, cell density, and epithelial oxygen uptake, etc. Other changes may include the formation of epithelial vacuoles and microcysts (containing cellular debris) as well as the emergence of polymegethism in the corneal endothelium.

6. Parfocal lens - Wikipedia

   en.wikipedia.org/wiki/Parfocal_lens

   Many zoom lenses, particularly in the case of fixed-lens cameras, are actually varifocal lenses, which gives lens designers more flexibility in optical design trade-offs (e.g., focal length range, maximal aperture, size, weight, cost) than parfocal zoom, which is practical because of auto-focus, and because the camera processor can ...

7. Northrop B-2 Spirit - Wikipedia

   en.wikipedia.org/wiki/Northrop_B-2_Spirit

   Ultimately, the program produced 21 B-2s at an average cost of $2.13 billion (~$4.04 billion in 2023), including development, engineering, testing, production, and procurement. Building each aircraft cost an average of US$737 million, [5] while total procurement costs (including production, spare parts , equipment, retrofitting , and software ...