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A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor Franciscus Cornelius Donders .
Ray-Ban is a brand of luxury sunglasses and eyeglasses created in 1936 by Bausch & Lomb. The brand is best known for its Wayfarer and Aviator lines of sunglasses. In 1999, Bausch & Lomb sold the brand to Italian eyewear conglomerate Luxottica Group for a reported $640 million.
An example of the Landolt C eye chart (also known as the Japanese eye chart). Numerous types of eye charts exist and are used in various situations. For example, the Snellen chart is designed for use at 6 meters or 20 feet, and is thus appropriate for testing distance vision, while the ETDRS chart is designed for use at 4 meters. [16]
A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
F.W. Hunter, Army test pilot, with AN 6531 sunglasses (1942) Aviator sunglasses are a style of sunglasses that was developed by a group of American firms. The original Bausch & Lomb design is now commercially marketed as Ray-Ban Aviators, although other manufacturers also produce aviator-style sunglasses.
EssilorLuxottica retail brands by number of locations in 2020 [34] Brand name Number of locations Sunglass Hut: 3,239 Óticas Carol 1,402 LensCrafters: 1,094 Vision Express 549 Pearle Vision: 548 Target Optical: 536 GMO 447 Salmoirgahi & Viganò 389 Oakley: 384 OPSM: 376 Ray-Ban: 248 David Clulow Optical 123 All others 153
1950s singer Buddy Holly helped popularise Wayfarers. Ray-Ban Wayfarer sunglasses and eyeglasses have been manufactured by Ray-Ban since 1952. Made popular in the 1950s and 1960s by music and film icons such as Buddy Holly, Roy Orbison and James Dean, Wayfarers almost became discontinued in the 1970s, before a major resurgence was created in the 1980s through massive product placements.
Ban numbers are not precisely defined, since some large numbers do not follow the standards of number names (such as googol and googolplex). There are several published sequences of ban numbers: The aban numbers do not contain the letter A. The first few aban numbers are 1 through 999, 1,000,000 through 1,000,999, 2,000,000 through 2,000,999, ...