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Another calculation for United States clinics using 20-foot chart distances (slightly more than 6 m), and using a 17 mm model eye for calculations, and a letter which subtends 5 minutes of arc, gives a vertical height of the 20/20 letter to be 8.75 mm. [8] Acuity charts are used during many kinds of vision examinations, such as "refracting" the ...
The Jaeger chart is a card on which paragraphs of text are printed, with the text sizes increasing from 0.37 mm to 2.5 mm. [15] This card is to be held by a patient at a fixed distance from the eye dependent on the J size being read. The smallest print that the patient can read determines their near visual acuity.
3.690 Mm – length of the Volga river, longest in Europe; 4.000 Mm – length of the Kalahari Desert; 4.350 Mm – length of the Yellow River; 4.600 Mm – width of the Mediterranean Sea; 4.800 Mm – length of the Sahara; 4.800 Mm – widest width of Atlantic Ocean (U.S.-Northern Africa) 5.100 Mm – distance from Dublin to New York as the ...
The template is intended for conversion of heights specified in either metres or in feet and inches. Template parameters [Edit template data] Parameter Description Type Status Metres m metre metres meter meters The height in metres. Do not use if feet and inches are specified. Number optional Centimetres cm centimetre centimetres centimeter centimeters The height in centimetres. Do not use if ...
Length; system unit code (other) symbol or abbrev. notes conversion factor/m combinations SI: gigametre: Gm Gm US spelling: gigameter 1.0 Gm (620,000 mi) megametre: Mm Mm US spelling: megameter
By default, the output value is rounded to adjust its precision to match that of the input. An input such as 1234 is interpreted as 1234 ± 0.5, while 1200 is interpreted as 1200 ± 50, and the output value is displayed accordingly, taking into account the scale factor used in the conversion.
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre).
fathom ≡ 6 ft 1.0 fathom (6.0 ft; 1.8 m) yard: yd yd assumes the international definition 1.0 yd (0.91 m) foot: ft (foot) ft long code "foot" outputs foot (and never feet) Use of ′ and ″ symbols violates MOSNUM so is not provided. 1.0 ft (0.30 m) ftin (feet and inches) ft m (foot m) inch: in in Use of ′ and ″ symbols violates MOSNUM ...