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Visual acuity with eye chart at Near 15.7 inches (400 mm) and without (sc: Latin sine correctore) correctors (spectacles); Ncc is with (cc: Latin cum correctore) correctors. See Visual_acuity#Legal_definitions: VA OS Left visual acuity VA OD Right visual acuity VDU Visual display unit VF Visual field VPS Variable prism stereoscope WD
The scale consists of 20 colors [1] (from light blue to dark brown-black) that correspond to the different eye colors observed in nature due to the amount of melanin in the iris (in this case, the lower the number, the lighter the eye color): [2] [3]
ANSI Z35.1 the Specifications for Accident Prevention Signs, [c] was an American standard that dictated the layout, colors and wording of safety signs in the United States. The standard is the first American standard that made specific demands for the design, construction, and placement of safety signage in industrial environments.
ANSI Z535.1 also explicitly uses multiple levels of hazard, including Yellow (Pantone 109) for 'caution' messages, and Orange (Pantone 151) for stronger 'warning' messages. [ 7 ] [ 8 ] [ 9 ] Like ISO 3864, ANSI Z535 includes multiple sections: ANSI Z535.6-2006 defines an optional accompanying text in one or more languages.
The Martin scale is an older version of color scale commonly used in physical anthropology to establish more or less precisely the eye color of an individual. It was created by the anthropologist Rudolf Martin in the first half of the 20th century.
The total number of genes that contribute to eye color is unknown, but there are a few likely candidates. A study in Rotterdam (2009) found that it was possible to predict eye color with more than 90% accuracy for brown and blue using just six SNPs. [16] [17] In humans, eye color is a highly sexually dimorphic trait. [18]
Although not required, it is recommended that all eyewear meet ANSI Z87.1, but for ballistic protective eyewear it is required that it meets military standards for impact protection (MIL-DTL-43511D clause 3.5.10 for goggles and visors and MIL-PRF31013 clause 3.5.1.1 for spectacles).
Glass chart. 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.