Looking for online definition of LENS or what LENS stands for? Our doctors define difficult medical language in easy-to-understand explanations of over 19,000 medical terms. Orthokeratology, or Ortho-K, is a lens fitting procedure that uses specially designed rigid gas permeable (RGP) contact lenses to change the curvature of the cornea to temporarily improve the eye . lens induction synonyms, lens induction pronunciation, lens induction translation, English dictionary definition of lens induction. See more. Acronyms. In order for the eye to . By changing its shape, the lens changes the focal distance of the eye. MedTerms online medical dictionary provides quick access to hard-to-spell and often misspelled medical definitions through an extensive alphabetical listing. lens definition: 1. a curved piece of glass, plastic, or other transparent material, used in cameras, glasses, and…. Drugs & Vitamins Drugs A-Z Generic Drugs A-Z Drugs by Classification Drugs Comparison (Drug Vs. They can prescribe glasses and contact lenses as well as check your eye's internal and external . spherical lens synonyms, spherical lens pronunciation, spherical lens translation, English dictionary definition of spherical lens. 5-alpha reductase: A chemical that changes the sex hormone testosterone into a substance called dihydrotestosterone.This hormone can cause the prostate gland to grow abnormally. MedTerms medical dictionary is the medical terminology for MedicineNet.com. The meaning of ACHROMATIC LENS is a lens made by combining lenses of different glasses having different focal powers so that the light emerging from the lens forms an image practically free of chromatic aberration. . For converging lenses, Φ > 0, so that the lenses are called positive. 35,278), Pas-de-Calais dept., N France. A lens is a transmissive optical device which focuses or disperses a light beam by means of refraction.A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis.Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a desired shape. The lens is located in the eye. The legal stuff: Understanding sale and supply rules "The good news is there's no specific age at which a child is old enough to wear contact lenses . Define Medically Necessary Contact Lenses. MedTerms medical dictionary is the medical terminology for MedicineNet.com. Read medical definition of Accommodation. Posterior to the lens is the vitreous body, which, along . lens synonyms, lens pronunciation, lens translation, English dictionary definition of lens. lens, device for forming an image image, in optics, likeness or counterpart of an object produced when rays of light coming from that object are reflected from a mirror or are refracted by a lens. Hard contact lenses are made of acrylic PMMA (poly-methyl-methacrylate or 'Perspex') or CAB (cellulose acetate-butyrate . Our doctors define difficult medical language in easy-to-understand explanations of over 19,000 medical terms. The lens is the transparent structure inside the eye that focuses light rays onto the retina. Encyclopedia; Wikipedia it was one of the most important coal centers in N France, but its mines are n lens [lenz] 1. a piece of glass or other transparent material so shaped as to converge or scatter light rays. noun: biconvex transparent body situated behind the iris in the eye; it focuses light waves on the . Lens. Accommodation: In medicine, the ability of the eye to change its focus from distant to near objects (and vice versa). The lens is part of the anterior segment of the human eye. Quick definitions from WordNet ( lens) noun: a transparent optical device used to converge or diverge transmitted light and to form images. Sensor takes a shine to surfaces. It is slightly overlapped at its margin by the ciliary processes. See more. MedTerms medical dictionary is the medical terminology for MedicineNet.com. In order for the eye to . They are employed in cameras for gathering the light rays. Diverging lenses, for which Φ < 0, are called negative. Eye: The organ of sight. Decorative contact lenses are considered medical devices. 743.36 Anomalies of lens shape spherophakia 743.37 Congenital ectopic lens 743.45 Aniridia 743.46 Other specified anomalies of the iris and ciliary body Diagnoses that Support Medical Necessity As listed in the "ICD-9 Codes that Support Medical Necessity" section of this policy. To compensate for such elements, an optical device has been improvised which consists of cylindrical lens, with narrow leaner focus in which . spherical lens: A lens in which all surfaces are spherical. MedTerms online medical dictionary provides quick access to hard-to-spell and often misspelled medical definitions through an extensive alphabetical listing. A cataract scatters and blocks the light as it passes through the lens, preventing a sharply defined image from reaching your retina. lens [lenz] 1. a piece of glass or other transparent material so shaped as to converge or scatter light rays. 2. the transparent, biconvex body separating the posterior chamber and the vitreous body of the eye; it refracts (bends) light rays so that they are focused on the retina. This process is achieved by the lens changing its shape.. Accommodation is the adjustment of the optics of the eye to keep an object in focus on the retina as its distance from the eye varies. MedTerms medical dictionary is the medical terminology for MedicineNet.com. contact lens. or advice of a legal, medical, or any other professional. contact lens: a lens that fits over the cornea and sclera or cornea only; used to correct refractive errors. Define lens cells. ICD-9 Codes that DO NOT Support Medical Necessity In order for the eye to . Lenses are basically magnifying glasses with curved sides. See also glasses. MedTerms online medical dictionary provides quick access to hard-to-spell and often misspelled medical definitions through an extensive alphabetical listing. Define lens subluxation. Due to the magnifying property, lenses are used in telescopes and other magnifying devices. As the cataract continues to develop, the clouding becomes denser. Lens (anatomy) synonyms, Lens (anatomy) pronunciation, Lens (anatomy) translation, English dictionary definition of Lens (anatomy). Definition of Lens. bandage lens: A lens placed on the cornea to protect it while it heals, e.g., after a corneal abrasion or keratoplasty. It is the process of adjusting the focal . Our doctors define difficult medical language in easy-to-understand explanations of over 19,000 medical terms. . Lens. Age-related and other medical conditions cause proteins and fibers within the lenses to break down and clump together, clouding the lenses. lens cells synonyms, lens cells pronunciation, lens cells translation, English dictionary definition of lens cells. The meaning of LENS is a piece of transparent material (such as glass) that has two opposite regular surfaces either both curved or one curved and the other plane and that is used either singly or combined in an optical instrument for forming an image by focusing rays of light. The FDA oversees their safety and effectiveness, just like contact lenses that correct your vision. The IOL can restore vision . Optometrist: A doctor trained to examine, diagnose, treat, and manage eye diseases and disorders. contact lens: [noun] a thin lens designed to fit over the cornea and usually worn to correct defects in vision. Eye lens definition, the lens of an eyepiece closest to the eye. See also: lens diopter: [noun] a unit of measurement of the refractive power of lenses equal to the reciprocal of the focal length in meters. Medical Device definition from the Medical Device Regulation MDR 2017/745 The full EU MDR Medical Device definition is: 'medical device' means any instrument, apparatus, appliance, software, implant, reagent, material or other article intended by the manufacturer to be used, alone or in combination, for human beings for one or more of the . In front of the lens is the iris, which regulates the amount of light entering into the eye.The lens is suspended in place by the suspensory ligament of the lens, a ring of fibrous tissue that attaches to the lens at its equator and connects it to the ciliary body. For more information visit our . Solid and liquid lenses are used for acoustic images, flaw detection, medical diagnosis, and the concentration of ultrasound for a variety of technological and biological purposes. Our doctors define difficult medical language in easy-to-understand explanations of over 19,000 medical terms. LENS is listed in the World's largest and most authoritative dictionary database of abbreviations and acronyms. Since the release of the first EF lens, launched alongside the EOS series in 1987, Canon has produced EF lenses featuring world-first technologies such as the EF75-300mm f/4-5.6 IS USM with IS in 1995, the EF400mm f/4 DO IS USM with a DO lens in 2001 and the EF24mm f/1.4L II USM, treated with highly antireflective lens Light rays converge when passing through a biconvex lens and diverge when passing through a biconcave lens .f indicates the focus. In other words, it focuses the light rays that pass through it (and onto the retina) in . An optical correction worn in contact with the cornea and taking the place of spectacles. Read medical definition of Eye. Contact lenses can only be fitted by a registered medical practitioner, optometrist or contact lens optician. 2. the transparent, biconvex body separating the posterior chamber and the vitreous body of the eye; it refracts (bends) light rays so that they are focused on the retina. Lens, Eye A transparent, biconvex structure of the EYE , enclosed in a capsule and situated behind the IRIS and in front of the vitreous humor ( VITREOUS BODY ). Our doctors define difficult medical language in easy-to-understand explanations of over 19,000 medical terms. Medical Definition of optical center. During the 19th and 20th cent. Our doctors define difficult medical language in easy-to-understand explanations of over 19,000 medical terms. The sensor uses a special cylindrical lens that widens the laser spot to what appears to the human eye to be an oval shape, though the actual shape is a very small line. noun: electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons. Called also crystalline lens. The meaning of CONTACT LENS is a thin lens designed to fit over the cornea and usually worn to correct defects in vision. Noun 1. lense - a transparent optical device used to converge or diverge transmitted light and to form images lens, lens system anastigmat - compound lens. Lens: The transparent structure inside the eye that focuses light rays onto the retina. abdominoplasty: A procedure to remove excess abdominal skin and tighten the underlying stomach muscles. The measure of the refracting power of a lens is its lens power Φ, which is a quantity inversely proportional to the focal length (Φ = 1/ f ') and measured in diopters (m -1 ). lens Light rays converge when passing through a biconvex lens and diverge when passing through a biconcave lens .f indicates the focus. Define lens cells. Lens definition, a piece of transparent substance, usually glass, having two opposite surfaces either both curved or one curved and one plane, used in an optical device in changing the convergence of light rays, as for magnification, or in correcting defects of vision. Start studying Medical Terminology - The Eye - Combining forms, Suffixes, and Prefixes. Medical Dictionary; Legal Dictionary. Note: Most Aetna plans exclude coverage of contact lenses and spectacles. An intraocular lens (IOL) is an artificial lens that can be implanted in the eye to replace a natural lens that has been damaged, for example, as a result of a cataract. 2013. See also glasses. means contact lenses that are determined to be Medically Necessary and appropriate in the treatment of patients affected by certain conditions. : a point on the axis of a lens that is so located that any ray of light passing through it in passing through the lens suffers no net deviation and that may be within, without, or on either surface of the lens. MedTerms medical dictionary is the medical terminology for MedicineNet.com. abdominal muscles: A flat sheet of muscles on the front of the abdomen, between the ribcage and the pelvis. Nonhomogeneous diverging air lenses are used to improve the directivity characteristics of loudspeakers. LENS - What does LENS stand for? Contact lens definition, one of a pair of small plastic disks that are held in place over the cornea by surface tension and correct vision defects inconspicuously. How to use contact lens in a sentence. Most contact lens wearers are shortsighted (myopic) and enjoy a generally better standard of vision than with glasses. Define lens induction. lens [lenz] 1. a piece of glass or other transparent material so shaped as to converge or scatter light rays. Our doctors define difficult medical language in easy-to-understand explanations of over 19,000 medical terms. lens Light rays converge when passing through a biconvex lens and diverge when passing through a biconcave lens .f indicates the focus. Online Medical Dictionary and glossary with medical definitions, l listing. The Free Dictionary. In general, contact lenses may be Medically Necessary and appropriate when the use of contact lenses, in lieu of eyeglasses, will result in significantly better visual and/or improved binocular function . 2. the transparent, biconvex body separating the posterior chamber and the vitreous body of the eye; it refracts (bends) light rays so that they are focused on the retina. MedTerms medical dictionary is the medical terminology for MedicineNet.com. How to use lens in a sentence. These components include but are not limited to the cornea, iris, pupil, lens, retina, macula, optic nerve, choroid and vitreous.. Matthew Scully-Hicks, 32, passed the rigorous adoption process with flying colours and professionals viewed his care of 18-month-old Elsie Scully-Hicks through a " positive lens ". Structure. See more. 'Missed chances' to protect baby murdered by adoptive father. MedTerms medical dictionary is the medical terminology for MedicineNet.com. While contact lenses and eyeglasses are rarely used in place of intraocular lenses in aphakia, contact lenses and eyeglasses are considered medically necessary under traditional medical plans as a prosthetic device following cataract surgery in lieu of intraocular lenses.
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