![]() The cylinder is an oval band on a lens that enables an individual to see all ranges clearly at once and is measured in diopters, like spherical power. Cylinderįor individuals with astigmatism, the cylinder power of a lens measures the degree to which a lens must account for astigmatism. The average size of a contact lens is between 13.5 and 15 millimeters. DiameterĪbbreviated “DIA” the diameter of a lens measures the width of a lens in millimeters, from end to end. If the cornea is more bulged or curved, this number will be lower. This measurement is noted in millimeters, usually between 8 and 10, and attempts to come as close to the curve of the eye as possible to ensure the greatest fit and comfort. Base CurveĪbbreviated “BC,” the base curve of a lens indicates the curvature on the inside of a lens. Desio Color contact lenses offer 22 different shades in Toric version for Astigmatism. Astigmatism can be corrected by toric contact lenses. The two types of astigmatism are regular and irregular. This may be due to an irregular or toric curvature of the cornea or lens. Astigmatismĭefined as an optical defect in which vision is blurred due to the inability of the optics of the eye to focus an object into a sharp focused image on the retina. If the power of the cornea and lens is insufficient, as in hyperopia, the image will appear blurred. As an object moves toward the eye, the eye must increase its optical power to keep the image in focus on the retina. ![]() Hyperopia or HypermetropiaĬommonly known as being farsighted or longsighted, is a defect of vision caused by an imperfection in the eye (often when the eyeball is too short or the lens cannot become round enough), causing difficulty focusing on near objects, and in extreme cases causing a sufferer to be unable to focus on objects at any distance. The opposite of myopia is hyperopia (long-sightedness). MyopiaĬommonly known as near-sightedness or short-sightedness is a condition of the eye where the light that comes in does not directly focus on the retina but in front of it, causing the image that one sees when looking at a distant object to be out of focus, but in focus when looking at a close object. The spherical power of a lens is indicated with a plus sign (+) for hyperopia and a minus sign (-) for myopia. The spherical power, indicated on the prescription as power “PWR” or sphere “SPH”, of a soft contact lens is calculated in a unit of measurement equal to the reciprocal of the focal length of a lens called a diopter “D”. If both the left and right eye has the same diagnosis and prescription information, the abbreviation “OU” is used instead, or “ocular uniter,” meaning both eyes. OS stands for oculus sinister, the Latin phrase for “left eye.” This abbreviation precedes the prescription information for the left eye, which is always listed second. OD stands for oculus dexter, the Latin phrase for “right eye.” This abbreviation precedes the prescription information for the right eye, which is always listed first. The prescription also includes: Right Eye (OD) Desio brands are available in two curvatures and different sizes and these measurements might not be included in the prescription. Send us feedback.A prescription for soft contacts includes a particular brand, as not all styles and materials are the same, and a number of other measurements per eye such as the curvature and diameter of the lens. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'spectacle.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. 2022 The story, the spectacle, the spirituality, the beauty - this is moviemaking & storytelling at its absolute finest. 2022 The latest thing to go down during his show in São Paolo, Brazil, on December 13, was a spectacle nobody saw coming - not even the Harry's House crooner. Spencer Kornhaber, The Atlantic, 22 Dec. 2022 But the difference between spectacle and spark, self-seriousness and serious entertainment, has never been more glaring. 2023 The celebs are thus here to provide spectacle, joy, beauty, glamour, kitsch, and maybe even outfit inspo. 2023 The public spectacle around Cyberpunk 2077's launch debacle, and the public statements from the company about its failures to recognize problems or inform customers, made an investor suit a near inevitability. Nate Atkins, The Indianapolis Star, 9 Jan. 2023 Football is America's spectacle, the entertainment gift that keeps on giving. Luke Broadwater, New York Times, 11 Jan. ![]() ![]() 2023 After a dayslong spectacle over the House speakership, the 118th Congress is underway, with Republicans controlling the House and Democrats holding the Senate. Recent Examples on the Web Fans freaked out over its bombastic spectacle, including scenes of wild fighting and dancing. ![]()
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