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The aging eye condition [1] A person with presbyopia cannot easily read the small print of an ingredients list (top) compared to someone without presbyopia (bottom). Specialty: Optometry, ophthalmology: Symptoms: Difficulty reading small print, having to hold reading material farther away, headaches, eyestrain [1] Usual onset
Instead, the half-life is defined in terms of probability: "Half-life is the time required for exactly half of the entities to decay on average". In other words, the probability of a radioactive atom decaying within its half-life is 50%. [2] For example, the accompanying image is a simulation of many identical atoms undergoing radioactive decay.
Marathon (Demotic Greek: Μαραθώνας, Marathónas; Attic/Katharevousa: Μαραθών, Marathṓn) is a town in Greece and the site of the Battle of Marathon in 490 BCE, in which the heavily outnumbered Athenian army defeated the Persians.
In 1909, Nathan Shigon of New York City invented [3] a monocular optometer with a range of +0.25 to +6.00 diopters, consisting of a mechanism where a disc of low-powered lenses advanced a second disc of higher power lenses automatically with each rotation, as in a modern phoropter.
The following is a list of centroids of various two-dimensional and three-dimensional objects. The centroid of an object in -dimensional space is the intersection of all hyperplanes that divide into two parts of equal moment about the hyperplane.
Stereoscopy creates the illusion of three-dimensional depth from a pair of two-dimensional images. [5] Human vision, including the perception of depth, is a complex process, which only begins with the acquisition of visual information taken in through the eyes; much processing ensues within the brain, as it strives to make sense of the raw information.
The Marathon du Médoc attracts around 8,500 participants, representing more than 50 nations, as well as many spectators. The marathon is organised by a volunteer association, with 2,800 volunteers. A similar event is the Marathon des premières côtes de Blaye.
The marathon race walk mixed relay is a racewalking mixed relay event over the marathon distance that was first contested at the 2024 Summer Olympics on 7 August. [1] [2] World Athletics and the International Olympic Committee introduced the race in April 2023. The distance of the race is that of a marathon; 26.219 miles or 42.195 kilometres.