How To Use Refractive In A Sentence
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Eyes that are not optimized in this way are said to have refractive errors (long sight or short sight).
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The athletes were tested for visual acuity, refractive error, oculomotor skills, stereopsis, color vision, contrast sensitivity, eye-hand coordination, eye-foot coordination, and overall ocular health.
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The photorefractive creates an index grating that couples light from one beam to another effectively compensating for any less than stellar phase-front negating any need for complicated optical alignment, spatial filtering, and columniation.
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People suffering from refractive errors have to wear corrective lenses if they want to see things clearly.
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A fundamental property called the refractive index governs the amount of light a material reflects, as well as other optical properties such as diffraction, refraction, and the speed of light inside the material.
The World’s Blackest Material | Impact Lab
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Through optical spectroscopy, researchers can probe the trapped particle's size, shape, refractive index and chemical composition.
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Chiron Vision develops and manufactures products for treating progressive eye diseases and for improving cataract and refractive surgery.
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[10] Photorefractive keratectomy (PRK) was the first kind of corrective eye surgery to involve a laser.
CreationWiki - Recent changes [en]
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If you are happy wearing contact lenses or glasses, you may not want to have refractive surgery.
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He calculated that a material that had a negative permittivity and a negative permeability would also have a negative refractive index.
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Particularly significant are the jet, amber and quartz items, valued as mortuary goods from prehistoric times onwards for their electrostatic and refractive properties.
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The material property which changes the speed of light in a material for a particular frequency is called refractive index.
Yahoo! Answers: Latest Questions
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Treatment may be surgical for muscle imbalance, use of refractive lenses, or patching the normal eye to allow the affected eye to regain strength and vision.
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At the height of the cold war, a Russian named Victor Veselago took a close look at something called the refractive index.
Ars Technica
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With SM-28 single mode fiber as the leading fibers, depth of modulation (DM) and coupling efficiency (CE) are calculated with relation to core radius and refractive index of core and inner cladding.
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Just schlieren video showing variation in the refractive index of fluids due to changes in density with temperature.
WN.com - Articles related to Delhi still battling heat wave
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Examples include cosmetic surgery, refractive eye surgery, and like it or not, abortion.
Brian T. Schwartz: Colorado Amendment 63: Freedom Is Too "Haphazard" for Bell Policy Center
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After randomisation, all children were tested for refractive error with cycloplegic drops to eliminate artefact due to accommodation.
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Photo refractive surgery is another available treatment for hypermetropia, as is laser eye surgery.
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The refractive or focusing power of the cornea can be measured with a keratometer.
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Light at each end of the optical spectrum is dispersed by a different amount, since the refractive index of any medium depends on frequency.
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The measurement of refractive index inhomogeneity of optical glass with laser hol lography was presented.
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The refractometer measures the refractive index of the total soluble solids.
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The cornea, the pupillary opening within the iris, the lens, and the aqueous and vitreous humor combine to form the refractive media of the eye.
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Based on these results it is recommended that that the compensating fusional reserve is always measured first during a refractive routine in order to get a true reading of the compensating fusional reserve.
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The crystalline lens, which provides approximately 30% of the refractive power, is biconvex and has the ability to change its shape to increase or decrease its focusing power.
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Just as people have myopia (short sight) and hypermetropia (long sight), Aberropia is another refractive error.
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In addition, the effects of wavelength, ellipticity and relative refractive index difference on the transmission constant are briefly analyzed.
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Refractive error is measured in dioptres, and myopia is designated with a minus sign.
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Your doctor may use a computerized refractor to measure your eyes and estimate the prescription you need to correct a refractive error.
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Two types of laser surgery-photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK) - are often used to correct refractive errors such as nearsightedness.
Gaea Times (by Simple Thoughts) Breaking News and incisive views 24/7
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SAN FRANCISCO -- Refractive surgery provides good long-term outcomes for children and young teens when lasers are used to correct anisometropia, but problems arise over time after lens implantation, according to separate studies reported here.
MedPageToday.com - medical news plus CME for physicians
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To achieve real density would require a volume hologram, made from a photorefractive crystal.
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The single advantage of refractive systems over their reflective counterparts is an absence of off-axis aberrations.
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The report provides information on the safety and effectiveness of four types of refractive eye surgery: radial keratotomy, photorefractive keratectomy, laser in situ keratomileusis and intraocular lenses.
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The most common form of refractive error is nearsightedness; others include farsightedness and astigmatism.
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Treatment may be surgical for muscle imbalance, use of refractive lenses, or patching the normal eye to allow the affected eye to regain strength and vision.
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The refractive index was chosen to reproduce dextran concentrations because dextran is hygroscopic.
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Apart from testing the eye, they supply booklets detailing eye care with particular reference to refractive errors such as myopia, hypermetropia and astigmatism.
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The experimental procedure, called photo-refractive keratectomy (PRK) and performed only by ophthalmologists, uses a new "excimer" laser to treat moderate degrees of nearsightedness (myopia).
A Light For Poor Eyes
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Optical interferometers (and other refractive index sensors) have features that make them versatile platforms for biomolecular sensing.
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Eyes that are anteriorly or posteriorly shorter than the normal eye size with too little refractive power are hyperopic, or farsighted.
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It's a laser eye surgery - called photorefractive keratectomy.
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Whether myopia, hyperopia or astigmatism is present, surgical correction attempts to redirect light rays to accommodate the refractive error.
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There are others, of rare occurrence in chains, which have a clear corpuscle, that is to say, a portion more refractive than other parts of the segments, at one of their extremities.
The Harvard Classics Volume 38 Scientific Papers (Physiology, Medicine, Surgery, Geology)
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Chiron Vision develops and manufactures products for treating progressive eye diseases and for improving cataract and refractive surgery.
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The presence of 1 dioptre of refractive error reduces Snellen visual acuity to less than 6/12 that is, below the level needed to drive.
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Concave lenses with minus or divergent power correct this refractive error and refocus the light rays on the correct point on the retina.
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This has excellent reflective and refractive properties, and so it is used to make ‘cut’ glass, engraved so as to reflect and refract light.
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In astigmatism, the refractive power of the eye is different in different meridians.
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An analytical differential refractive index detector was used.
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But bending light so that it passes round a region of space and emerges travelling along the same line as it was initially is a difficult trick, requiring an invisibility cloak made from materials with a 'tunable' refractive index.
Invisible Man Almost Visible
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Apart from testing the eye, they supply booklets detailing eye care with particular reference to refractive errors such as myopia, hypermetropia and astigmatism.
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Methods include visual examination, study of the absorption spectrum, and measurement of refractive indices, specific gravity, and thermal conductivities.
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We considered intensity distribution of light focused by a high numerical aperture lens without spherical aberration through a planar interface between materials of mismatch refractive index.
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Two types of laser surgery-photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK) - are often used to correct refractive errors such as nearsightedness.
Gaea Times (by Simple Thoughts) Breaking News and incisive views 24/7
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My investigation counterposes two modes of narrative vision suggested by fictive looks at death: reflective and refractive.
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Concave lenses with minus or divergent power correct this refractive error and refocus the light rays on the correct point on the retina.
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The dioptric power of this liquid lens depends on the refractive indices of the materials and the radius of curvature of the interface.
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This formula is accompanied by another which makes it possible to deduce the refractive index of a chemical compound from its composition, admittedly only in rough approximation as was possible earlier with the aid of certain empirical formulae.
Hendrik A. Lorentz - Nobel Lecture
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One alternative for 126 nm is to eliminate refractive or catadioptric designs and instead use an all-reflective approach.
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Refractive error not associated with amblyopia principally includes myopia and hyperopia.
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It principally manifests itself as an increase of the dark adaptation threshold, nystagmus, and often moderate to high short sightedness, although the refractive state may be long sighted or normal.
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Objective: To investigate the feasibility of lamellar keratoplasty combined with photorefractive keratectomy(PRK) and phototherapeutic keratectomy(PTK)and provide theoretical basis for clinical study.
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The cornea, the pupillary opening within the iris, the lens, and the aqueous and vitreous humor combine to form the refractive media of the eye.
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Re-refract (cycloplegic) b) Verify steep refractive axis within 20° of topographic axis c) Default to topographic Max K (steep axis) d) In PMD, the steep axis will typically present across the top of the "crab claw" or "kissing dove" topographic image.
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It is shown that the Goos-Hnchen shift of the transmitted light beam in propagating case is a periodical function of the air-gap thickness, incidence angle and the refractive index of two prisms.
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These had the refractive indices and gave the chemical reactions of lazulite, which is a hydrous phosphate of aluminum, iron and magnesium.
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Light pollution refers to the radiation in sunlight, lamp light or other reflected or refractive light.
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A diopter is a unit of measure used in ophthalmology to indicate the degree of refractive error of the lens of the eye.
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The following topics were dealt with: high power lasers; photorefractive materials and devices; surface emitting lasers; interferometric techniques; switching devices …
IEEE Spectrum
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For most gemstones the refractive index can be measured with a gemmologist's refractometer, but the refractive indices of diamond, some zircons, and certain other gem materials are too high to be measured with most of these instruments.
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Incoherently coupled dark-dark , bright-bright and bright-dark screening soliton pairs in centrosymmetric photorefractive crystals are possible due photorefractive effect.
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With SM-28 single mode fiber as the leading fibers, depth of modulation (DM) and coupling efficiency (CE) are calculated with relation to core radius and refractive index of core and inner cladding.
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Photorefractive keratectomy (PRK) can be used on patients who have myopia, hyperopia, or an astigmatism.
CreationWiki - Recent changes [en]
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Its low refractive index, compared with that of the pigments, cause the scattering of considerable amounts of incident light, resulting in less saturated colours.
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Most refractive surgical procedures were developed to correct nearsightedness, farsightedness and astigmatism.
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Opal, which is a comparatively light mineral, has a low refractive power; zircon or jargoon is a heavy mineral, and has a high refractive power.
Scientific American Supplement, No. 1082, September 26, 1896
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The transparent convex cornea contributes approximately 70% of the refractive power of the eye.
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For accuracy, the images should have strong grayscale contrast between materials of different refractive indices.
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Whether myopia, hyperopia or astigmatism is present, surgical correction attempts to redirect light rays to accommodate the refractive error.
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First, they are structural proteins that contribute to the refractive powers of the lens.
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Nonsolution shell real and imaginary refractive indices account for spectrally-resolved UV and short visible absorption by nitrated and aromatic aerosols and other UV-absorbing organic aerosol components.
Climate Models – the Next Generation « Climate Audit
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Ames Laboratory senior physicist Costas Soukoulis, working with colleagues in Karlsruhe, Germany, designed a silver-based, mesh-like material that exhibits a refractive index of -0.6 at the red end of the visible spectrum.
The Burning Man in the High Castle
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Older aviators and farsighted aviators may require trifocals, which have two sets of near - vision refractive glass to focus on intermediate and near distances.
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This is incorrect, because the plano (i.e. no refractive power) surface of the clear glass does not bend the incoming light before it is reflected, otherwise the mirror would magnify, minify, or distort astigmatically.
Sadly, No!
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The intensity of scattering is a function of the electron density and therefore of the refractive index.
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The idea that the way in which we use our eyes early in life can affect ocular growth and refractive error is gaining scientific credence.
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Two well conducted and well controlled studies show that refractive errors are much more strongly correlated in monozygotic twins than in dizygotic twins.
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This study confirms an inverse association between ACD and age, female gender, and spherical refractive error. Eyes with shallower ACDs had narrower angles.
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Photo-refractive keratectomy involves treating the surface of the cornea with an Excimer laser which results in flattening of the cornea to correct myopia.
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Monovision correction can be accomplished with LASIK as well as conductive keratoplasty (CK) and other corneal or lens-based refractive surgeries. 」
マイコミジャーナル
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He could see, rearing up above the waves, the spires and minarets and twisted towers and diamantine domes, and even, in the misty height, the very palace of the High Shivantak—and the whole image ghostly, fringed with refractive rainbows.
Do Comets Dream?
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Even a small refractive error corrected by glasses with an anti-reflection coating will reduce glare.
Times, Sunday Times
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The intensity of scattering is a function of the electron density and therefore of the refractive index.
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This condition is probably heavily implicated in osteoporosis and, according to my evidence, is a principal cause of increased distensibility of the sclera (the white outer coat of the eyes), allowing more rapid development of nearsightedness (myopia) and other refractive changes.
What foods, minerals, vitamins, and fatty acids help your eyes?
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Visual impairment caused by refractive error, amblyopia, strabismus, and astigmatism is a common condition among young children, affecting 5 to 10 percent of all preschoolers.
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General manager Paul Holmgren says Briere will have a procedure called photorefractive keratectomy.
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Refractive errors mean that the shape of the eye doesn't refract, or bend, light properly, so images appear blurred.
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The most common causes of amblyopia are misalignment of the eyes (crossed eyes) or significant differences in refractive error, such as farsightedness or nearsightedness, between the two eyes.
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Unlike earlier reductions, this particular transition requires a major design shift in stepper optics from refractive to reflective.
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The spacing of the rods, each of which measured one thousandth of a millimetre wide, alters a property of the material known as the refractive index, which changes the speed of light inside it.
The Guardian World News
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Consists of a very thin glass core surrounded by a material of slightly lower refractive index called cladding
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Information is encoded as holographic pixels, or 'hogels', by pulsed laser beams and written into the photorefractive polymer.
Times, Sunday Times
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When hyperopia or long sight (plus lenses) is the pre-existing refractive condition the ability to focus near object is also lost at 40 years of age.
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They mean the existence of the additional optical path difference when two beams of laser transit along two opposite directions in the photorefractive crystal.
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With SM-28 single mode fiber as the leading fibers, depth of modulation (DM) and coupling efficiency (CE) are calculated with relation to core radius and refractive index of core and inner cladding.
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Because a negative refractive index implies dispersion, and thus a certain degree of loss, perfect lens operation is not feasible.
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Another abstract considers the incidence and severity of corneal haze after photorefractive keratectomy - another refractive correctional procedure developed before LASIK surgery.
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In this paper. the influence of refractive index change under different conditions such as the laser incidence angle, the angle between micro-cantilever and liquid surface is theoretically analyzed.
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Today's optical designers face new challenges when designing and modeling refractive systems.
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In another feat of memory, researchers reported two years ago that a light-induced electric field could imprint a new refractive index along one dimension of a ferroelectric crystal.
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He calculated that a material that had a negative permittivity and a negative permeability would also have a negative refractive index.
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Apart from testing the eye, they supply booklets detailing eye care with particular reference to refractive errors such as myopia, hypermetropia and astigmatism.
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Which refractive error is also known as hyperopia?
Times, Sunday Times
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However, starch granules are not refractive under bright field microscopy and usually have an indented center.
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The colour and the luminous, refractive properties of his material, and the open levels of two of its three linked structures, make it both something to look at and to look through.
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_Lamina_ or Plate of a transparent or pellucid body of a thickness very determinate and proportioned according to the greater or less refractive power of the _pellucid_ body.
Micrographia Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses with Observations and Inquiries Thereupon
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The miscibility of CS blends in formic acid was characterized by solubility parameter, dilute solution viscometry, refractive index and glass transition temperature, FT-IR etc.
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Younger patients with presbyopia, in which near vision becomes blurry, also may eliminate the need for glasses with a multifocal IOL, a procedure called refractive lens exchange that is typically not covered by insurance.
THE MEDICAL NEWS
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Refractive eye surgery is a surgical procedure to change the way your eye refracts light.
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Aerosol shell refractive indices account for solution and nonsolution components.
Climate Models – the Next Generation « Climate Audit
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The problem here is that PPLN suffers from photorefractive damage when subjected to visible radiation.
Optics.org all content
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Two types of laser surgery-photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK) - are often used to correct refractive errors such as nearsightedness, according to background information in the article.
Undefined
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Photorefractive keratectomy evolved concurrently with the development of laser technology within refractive surgery.
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[11] Photorefractive keratectomy (PRK) was the first kind of corrective eye surgery to involve a laser.
CreationWiki - Recent changes [en]
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Photoscreening can detect amblyogenic risk factors such as strabismus, significant refractive error, and media opacities; however, photoscreening cannot detect amblyopia.
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This new refractive procedure is capable of reducing or even eliminating the need for bifocals or reading glasses for certain categories of patients.
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In _A. frostiana_ and the pale forms of the species the spores are nearly globose or oval, rarely with a tendency to become elliptical, but _the content is quite constantly finely granular_, while the spores of _A. cothurnata_ are perhaps more constantly globose or nearly so, but the spore is _nearly filled with a highly refractive oil globule or "nucleus.
Studies of American Fungi. Mushrooms, Edible, Poisonous, etc.
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Objective To measure and analyze the refractive state, biometry data and the correlation between diopter and refractive factor in 4-13 years-old children.
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In many photonic structures composed of two or more dielectrics, the absolute value of the refractive index contrast is critical to performance.
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Photorefractive keratectomy is similar to LASIK but does not involve use of a corneal incision or a flap.
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The experimental procedure, called photo-refractive keratectomy (PRK) and performed only by ophthalmologists, uses a new "excimer" laser to treat moderate degrees of nearsightedness (myopia).
A Light For Poor Eyes
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We adopt differ method for corresponding differ accuracy in radio wave refractive errors correction.
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A new measurement method of refractive index of plane-parallel plate has been introduced in this paper, which is performed by thin laser beam.
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Refractive error is measured in dioptres, and myopia is designated with a minus sign.
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For all the fun that's been had online in the past few days, recasting all the players in the media row, it doesn't actually need refractive tinkering; it was dramatic enough, as is all the best history.
Rewind TV: The Hour; The Apprentice; Show Me the Funny; Imagine; Richard Hammond's Journey to the Centre of the Planet; Twenty Twelve – review
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Both compounds increase the refractive qualities of the glass, giving it a diamond-like brilliance.
Times, Sunday Times
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North Korea is in favor of photorefractive keratectomy is a type of laser refractive surgery to correct the error for the restructuring of the surface of the cornea, instead of the sculpture in the cornea.
MyLinkVault Newest Links
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The excimer laser can be used either on the surface, after removing corneal epithelium before treatment (photorefractive keratectomy), or within the stroma, after cutting a corneal flap (laser in situ keratomileusis or LASIK).
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This simple demonstration provides an understanding of refractive lens power and promotes a discussion of why a mask helps you see underwater.
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-- Refractive Index Correction improves beamformer performance by correcting phase errors caused by speed of sound differences between the probe case and body.
Samplify Introduces Powerful New Ultrasound Beamformer Technology
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This discrepancy in focal length is a measure of the astigmatism, often referred to as the astigmatic difference, and will depend on the inclination angle of the light rays and the lens power (as opposed to the shape or refractive index).
Undefined
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My investigation counterposes two modes of narrative vision suggested by fictive looks at death: reflective and refractive.
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There's also another gem called chrysoberyl that's really durable and has a higher refractive index than other gems so it throws flashes of color much like a diamond.
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The exquisite precision of this ultraviolet laser could be harnessed to sculpt and recontour the corneal surface, a procedure termed as photorefractive keratectomy.
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Refractive Index Correction improves beamformer performance by correcting phase errors caused by speed of sound differences between the probe case and body.
The Earth Times Online Newspaper
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The presence of 1 dioptre of refractive error reduces Snellen visual acuity to less than 6/12 that is, below the level needed to drive.
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To achieve real density would require a volume hologram, made from a photorefractive crystal.
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ObjectiveTo study the role of mitomycin C(MMC) and hyaluronic acid (HA) on the proliferations of normal and photorefractive keratectomy(PRK) rabbit corneal fibroblasts.
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A new study suggests that people who have their nearsightedness corrected with either LASIK or photorefractive keratectomy, a slightly older
WN.com - Articles related to Plugging Into the Eye, With a New Design
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To eliminate the residual aberration in the spherical lens, we need to increase the refractive index of the glass.
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Strabismic amblyopia usually presents with a visible squint, but refractive amblyopia or a small angle strabismus may not be detected until it is too late for treatment to be effective.
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Photorefractive keratectomy evolved concurrently with the development of laser technology within refractive surgery.
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The Kerr effect, also called the quadratic electro-optic effect (QEO effect), is a change in the refractive index of a material in response to an applied electric field.
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In children with refractive error, the lens of the eye does not bend the right way.
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the refractive characteristics of the eye
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These proteins, aptly called crystallins, give the lens its refractive properties and long-term transparency.
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The refractive optics that form the reduced image of the scene in the reverse-Galilean viewfinder are identical to those of the Albada viewfinder.
