How to use refractive in a sentence

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Sentence Examples Plasma has a lower refractive index than vacuum, so the wavefront moving through the center of the channel moves more slowly than at the edges. Unlike earlier reductions, this particular transition requires a major design shift in stepper optics from refractive to reflective. 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. Light pollution refers to the radiation in sunlight, lamp light or other reflected or refractive light. A diopter is a unit of measure used in ophthalmology to indicate the degree of refractive error of the lens of the eye. However, starch granules are not refractive under bright field microscopy and usually have an indented center. Light at each end of the optical spectrum is dispersed by a different amount, since the refractive index of any medium depends on frequency. Varying the voltage across the lens, the researchers could change the focal length of the lens, because this alters its refractive index. Your doctor may use a computerized refractor to measure your eyes and estimate the prescription you need to correct a refractive error. These had the refractive indices and gave the chemical reactions of lazulite, which is a hydrous phosphate of aluminum, iron and magnesium. The refractive or focusing power of the cornea can be measured with a keratometer. To eliminate the residual aberration in the spherical lens, we need to increase the refractive index of the glass. Most refractive surgical procedures were developed to correct nearsightedness, farsightedness and astigmatism. In astigmatism, the refractive power of the eye is different in different meridians. Whether myopia, hyperopia or astigmatism is present, surgical correction attempts to redirect light rays to accommodate the refractive error. After randomisation, all children were tested for refractive error with cycloplegic drops to eliminate artefact due to accommodation. In many photonic structures composed of two or more dielectrics, the absolute value of the refractive index contrast is critical to performance. Photorefractive keratectomy evolved concurrently with the development of laser technology within refractive surgery. Because a negative refractive index implies dispersion, and thus a certain degree of loss, perfect lens operation is not feasible. For accuracy, the images should have strong grayscale contrast between materials of different refractive indices. Show More Sentences Just as people have myopia and hypermetropia, Aberropia is another refractive error. The refractive index of the lens material varies from the core to the surface, naturally correcting for spherical aberration. Today's optical designers face new challenges when designing and modeling refractive systems. 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. The dioptric power of this liquid lens depends on the refractive indices of the materials and the radius of curvature of the interface. Through optical spectroscopy, researchers can probe the trapped particle's size, shape, refractive index and chemical composition. Eyes that are anteriorly or posteriorly shorter than the normal eye size with too little refractive power are hyperopic, or farsighted. He calculated that a material that had a negative permittivity and a negative permeability would also have a negative refractive index. One alternative for 126 nm is to eliminate refractive or catadioptric designs and instead use an all-reflective approach. In this study, three groups of people with different degrees of myopia were assessed for optic disc ovalness, refractive error and axial length. The refractive index was chosen to reproduce dextran concentrations because dextran is hygroscopic. Photo refractive surgery is another available treatment for hypermetropia, as is laser eye surgery. When hyperopia or long sight is the pre-existing refractive condition the ability to focus near object is also lost at 40 years of age. Concave lenses with minus or divergent power correct this refractive error and refocus the light rays on the correct point on the retina. These proteins, aptly called crystallins, give the lens its refractive properties and long-term transparency. The single advantage of refractive systems over their reflective counterparts is an absence of off-axis aberrations. In children with refractive error, the lens of the eye does not bend the right way. First, they are structural proteins that contribute to the refractive powers of the lens. Eyes that are not optimized in this way are said to have refractive errors. This simple demonstration provides an understanding of refractive lens power and promotes a discussion of why a mask helps you see underwater. Show More Sentences People suffering from refractive errors have to wear corrective lenses if they want to see things clearly. If you are happy wearing contact lenses or glasses, you may not want to have refractive surgery. Two well conducted and well controlled studies show that refractive errors are much more strongly correlated in monozygotic twins than in dizygotic twins. The fabrication team measured the optical surface using phase-shifting interferometry and a refractive null corrector near the center of curvature. Particularly significant are the jet, amber and quartz items, valued as mortuary goods from prehistoric times onwards for their electrostatic and refractive properties. This new refractive procedure is capable of reducing or even eliminating the need for bifocals or reading glasses for certain categories of patients. 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. 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. The refractive optics that form the reduced image of the scene in the reverse-Galilean viewfinder are identical to those of the Albada viewfinder. Lazy eye can be caused by a refractive disorder or cross eyes. An analytical differential refractive index detector was used. In the optical tweezers experiment, a particle having a larger refractive index than its surrounding medium is trapped by the radiation pressure of a focused laser beam. By surrounding a transparent fibre core with a second material that has a lower refractive index, light in the inner core is trapped by total internal reflection. Methods include visual examination, study of the absorption spectrum, and measurement of refractive indices, specific gravity, and thermal conductivities. A global observer sees a region around rotating black holes, called the ergosphere, as possibly bending electromagnetic radiation according to a negative refractive index. Apart from testing the eye, they supply booklets detailing eye care with particular reference to refractive errors such as myopia, hypermetropia and astigmatism. 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. Its low refractive index, compared with that of the pigments, cause the scattering of considerable amounts of incident light, resulting in less saturated colours. Crystallins are a diverse group of proteins that produce the refractive properties of the ocular lens. Mulberrylike clusters of cocci enveloped in mucoid capsular material that appears light against the denser, more refractive, albumin solution. Show More Sentences The cornea, the outer covering of the eye, is relative flat and so of low refractive power. This particle separation and size influences optical properties of gases as can be found in the following list of refractive indices. Cedar oil, having a similar refractive index, is often used in this widely adopted practice. Other liquids, including synthetic oils and polymers with refractive indexes close to that of emeralds, such as Opticon, are also used. This makes the estimation of the refractive index of the turbid liquid quite problematic. The refractive index and Abbe number were measured at the gate and flow end areas indicated in Fig. Procured the delivery device for measuring the refractive index and dispersion of materials by the m-line. This article looks at the development of, and changes in, refractive error and accommodation in infancy. In one set of experiments, Mescher removed each spicule's star-shaped cap and measured the refractive index of the remaining shaft. Refractometry measures the refractive index, which is related to the total mass of solutes present in the urine. Doing the evaluation with respection of length contraction as well as refractive index effects leads indeed to a non-null result. Birefringence is caused by the difference in refractive index between polymers at different viewing angles. The model also explains the skewness towards myopia of the distribution of refractive errors. Rods have a higher refractive index than their surrounding tissue, making them ideal to channel light through total internal reflection. The SEC analyses of PP were carried out using a chromatograph Polymer PL 220 model equipped with a refractive index and a viscosimetric detector. The cornea is the first major refractive surface of the eye and is responsible for over two thirds of its overall dioptric power. Early symptoms of adult-onset diabetic cataract are persistent refractive changes, glare, and monocular diplopia or polyopia. Post-operative outcomes of a 56-year-old male patient receiving IntraCor refractive surgery Vision Sph Cyl Axis LE 1 week post-op. Spores were ovoid, with a marked gelatinous epispore and a solid, refractive endospore. Part 3 Lot 1 Hydrophobic acrylic, three-bodied, biconvex, haptics monofilament, C-loop PMMA, the refractive index min. Show More Sentences Also, a graphical representation of the optical refractive indicatrix was suggested. The use of femtosecond lasers in corneal transplants has created a revolution in more precise matching between donor and recipient corneas and better refractive outcomes. Therefore, a study determines their anatomical pattern so that they serve as a model for comparison with eyes that have refractive defects pathological eyes. For example, if the patient has diplopia or photopsia and floaters, this will need to be investigated and a specialist opinion sought before refractive surgery can proceed. The computerised, autorefractometer quickly gives information about the refractive error of the patient in terms of sphere, cylinder with axis and interpupillary distance. The matrix provides detailed performance data, including functionality, color, viscosity, density, refractive index, elongation, modulus, glass transition temperature, etc. You often find that some patients have inadvertently been using monovision because of refractive changes and so may be less happy when refitted with multifocals or bifocals. The developer of a breakthrough approach to astigmatism analysis sees a risk in the recent trend to link refractive lasers to corneal topography machines. Controlling light waves as they pass through or bounce off of hundreds or thousands of layer interfaces is defined by the refractive index of the adjacent polymers. The Nidek MK-2000 Keratome System is designed to create a lamellar flap on the surface of the cornea during refractive procedures, such as keratoplasty. This is described as 'defocus-induced' or 'compensatory' ametropia and suggests that blurring of an image on the retina can lead to induction of a refractive error. The material boasts a stable Abbe number at 10 to 60 C and a refractive index that's stable at those temperatures and wavelengths from 40 to 700 nm. Stenopaeic slit refraction is usually attempted when retinoscopy and more conventional subjective refractive techniques, i.e. JCC and FC, fail to provide satisfactory results. In the presence of a plasma nonhomogeneity, the chromatic refractive deflection also occurs, so the presence of plasma always makes gravitational lensing chromatic. Some bumps are coated with high refractive index glass beads. Examples from Classical Literature Now the refractive index of Iceland spar is, for the extraordinary ray less, and for the ordinary greater, than for Canada balsam. The otolith is an oval body with its dorsal half pigmented, and its ventral half clear and highly refractive. A mounting medium of the highest refractive index, such as realgar, is required to resolve the stri. The number 1.336 is termed the refractive index, or coefficient, or the refractive power of water. The variation of refractive index with density has been the subject of much experimental and theoretical inquiry. Perhaps the surest single method of distinguishing precious stones is to find out the refractive index of the material. It sparkles about as brilliantly, for its refractive index is nearly as high. This sphere of refractive material he calls the 'capitellum' of the chordotonal thread. Yeast-cells are smooth, colorless, highly refractive, spheric or ovoid cells. This effect, like the refractive power and focal distance, varies in degree in different diaphanous substances. The amount of refractive error is very great if an object 23lies near the horizon. In this case the earth is the kiln, and the stars the object that is viewed through the refractive medium. Where the surface was hard and dense, Brewster found the refractive index to approach that of semi opal. The nucleolus is a minute solid spot in a nucleus, appearing to be more highly refractive. Therefore the greater the radius of the air hole is, the effective mode has more similar curve with the effective refractive index. It is perfectly transparent, yet it has refractive qualities. It has the least refractive power on light of any body known. Thus they remained ignorant of the refractive powers of the air. Nevertheless it is well established that after refractive errors, chromatic aberrations are the most significant theoretical cause of poor image quality. This includes an increased risk of subnormal visual acuity, visual perceptual problems, strabismus, refractive errors and reduced contrast sensitivity and visual fields. Find more words! 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What is the adjective for refractive? What is the noun for refractive? Use our Sentence Generator Nearby Words refractions refraction refracting telescope refracting refractile refracted refractivity refractometer refractometry refractor refractoriness refractory 10-letter Words Starting With r re ref refr refra refrac refract refracti refractiv