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Cataract surgery is the most common application of lens removal surgery, and is usually associated with lens replacement. It is used to remove the natural lens of the eye when it has developed a cataract, a cloudy area in the lens that causes visual impairment. [4][10] Cataracts usually develop slowly and can affect one or both eyes. [4]
A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers. Liquid crystals do not emit light directly [1] but instead use a backlight or reflector to produce images in color or monochrome.
Ibn al-Haytham was the first to correctly explain the theory of vision, [14] and to argue that vision occurs in the brain, pointing to observations that it is subjective and affected by personal experience. [15] He also stated the principle of least time for refraction which would later become Fermat's principle. [16]
If you do use your phone to regularly surf the internet, spring for the 10G data plan ($35/month) or unlimited plan ($50/month). Comparing plans, Verizon offers its unlimited one-phone plan for ...
In medicine, a prosthesis (pl.: prostheses; from Ancient Greek: πρόσθεσις, romanized: prósthesis, lit. 'addition, application, attachment'), [1] or a prosthetic implant, [2] [3] is an artificial device that replaces a missing body part, which may be lost through physical trauma, disease, or a condition present at birth (congenital disorder).
Konstantin Konstantinov (1817/1819–1871), Russia – device for measuring flight speed of projectiles, ballistic rocket pendulum, launch pad, rocket-making machine Sergei Korolev (1907–1966), USSR – first successful intercontinental ballistic missile ( R-7 Semyorka ), R-7 rocket family , Sputniks (including the first Earth-orbiting ...
Prism is the fourth studio album by American singer Katy Perry. It was released by Capitol Records on October 18, 2013. While the album was initially planned to be "darker" than her previous material, Prism ultimately became a prominently dance-inspired record. Perry worked with several past collaborators, while enlisting new producers and ...
Buzz Aldrin (/ ˈɔːldrɪn /; born Edwin Eugene Aldrin Jr.; January 20, 1930) is an American former astronaut, engineer and fighter pilot. He made three spacewalks as pilot of the 1966 Gemini 12 mission, and was the Lunar Module Eagle pilot on the 1969 Apollo 11 mission. He was the second person to walk on the Moon after mission commander Neil ...
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