How To Use Astigmatism In A Sentence
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Similarly, the variation of distance refraction and the presence of astigmatism is also lower than for humans.
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Astigmatism is caused when the cornea is shaped irregularly like a football.
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Typical aberrations that can impact imaging performance include astigmatism, chromatic aberration, and spherical aberration.
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In the treatment of ‘gross’ errors of refraction - myopia, astigmatism and hyperopia - LASIK is one of the procedures of choice.
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Another defect of the eye, known as astigmatism, is due to the fact that the eye does not always have a perfectly spherical front (cornea).
The Science of Human Nature A Psychology for Beginners
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Ordinary soft lenses tend to mould to the astigmatic curve, but special toric soft lenses are available for astigmatism.
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After the surgery, I definitely saw better - my previous vision had been -7 and -7.5 with severe astigmatism, which is a short step away from being totally non-functional - but after two weeks, I went back in for another corrective round.
Nad hen j��c eto
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Deriving from his specialised knowledge of optometry, this cylindrical lens imitates what happens in astigmatism.
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The degree of astigmatism should not exceed more than four diopters.
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When the lens is distorted, you have lenticular astigmatism.
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When all goes well, nearsighted and farsighted patients alike, as well as those with astigmatisms, end up with vastly improved, sometimes perfect vision.
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Incorporating patented HyperBond (TM) technology and HydrolEyes (TM) surface science, the SynergEyes (R) contact lenses with FDA market clearance include: SynergEyes (R) A for naturally occurring ametropia, targeting patients with astigmatism, current gas permeable lens wearers, and patients demanding optimized vision; the SynergEyes (R) Multifocal lens for presbyopia;
THE MEDICAL NEWS
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Astigmatism: An astigmatism occurs when the cornea or lens (or both) are not perfectly symmetrical.
CreationWiki - Recent changes [en]
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People with astigmatism usually need to wear glasses or contact lenses to correct their vision.
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Have the nearsighted patient of astigmatism, can you adorn invisible glasses?
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* '' 'Astigmatism:' '' An astigmatism occurs when the cornea or lens (or both) are not perfectly symmetrical.
CreationWiki - Recent changes [en]
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I have discovered ametropia in the particular form of irregular astigmatism.
Mr. World and Miss Church-Member A twentieth century allegory
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The use of aspherical lens elements in both of the front and rear lens groups effectively compensates for distortion, spherical aberration and astigmatism.
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By a curious paradox, however, it often happens that the headache due to eye-strain is caused not by the grosser defects, such as interfere with vision so seriously as absolutely to demand the wearing of glasses to see decently, but from slighter and more irregular degrees and kinds of misshapenness in the eye, most of which fall under the well-known heading of astigmatism.
Preventable Diseases
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It is a surgical treatment for short-sightedness, some forms of long-sightedness and astigmatism and is carried out by ophthalmic surgeons.
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The most common form of refractive error is nearsightedness; others include farsightedness and astigmatism.
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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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Whether myopia, hyperopia or astigmatism is present, surgical correction attempts to redirect light rays to accommodate the refractive error.
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We have disposable soft toric lenses that correct for low to moderate amounts of astigmatism, as well as custom toric lenses that correct for higher amounts of astigmatism.
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Contact lenses can balance the image from both eyes, and correct any irregularities or astigmatism of the eye.
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In astigmatism, the refractive power of the eye is different in different meridians.
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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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22. Medicine and Health
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But if you have an astigmatism your choices are very limited; so far only Freshlook offers toric color contacts.
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Suitable for most people who need glasses, including those who are short-sighted, long-sighted or have astigmatism, laser eye surgery treatment is quick, easy and affordable.
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The surfaces of the lens or cornea may not be smooth, causing an aberration that results in a streak of distortion called astigmatism.
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Compared with the stigmatic lens, the astigmatism gives rise to a shift of the position of on-axis maximum intensity, and reduces the intensity at the real focal point.
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A machine using an excimer laser can be used to vaporise parts of the outer surface of the corneas so as to convert these into spherical lenses and permanently correct the astigmatism.
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Of course, it was distorted because NPJLSB had astigmatism, so then I used some kind of computer with clear screens and a virtual headset to de-convolve the image over 23 hours of super -computing time Ok, so I shut down the large Haydron accelerator, but this was important.
Soft Pedaling: Taking it Easy
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As such, the anastigmat offers an attractive compromise between astigmatism and field curvature.
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Define the following term: astigmatism, binocular vision, focal length, lens accommodation, optic disk, papillary constriction, retinal field, visual field.
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There is a greater number of the population who are farsighted, have astigmatism, or have a combination of astigmatism with either farsightedness or nearsightednes.
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Similarly, the variation of distance refraction and the presence of astigmatism is also lower than for humans.
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‘This is something that can often be a problem with toric lenses, which are designed to correct astigmatism,’ said Caroline.
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He said developments are expected within a year which will not only enable severe astigmatism to be corrected but also long-sightedness.
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Astigmatism may occur with myopia or hyperopia.
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uncorrected astigmatism
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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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Despite what has been called the moral astigmatism of the Tuskegee study, not all of its lessons are negative.
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Most refractive surgical procedures were developed to correct nearsightedness, farsightedness and astigmatism.
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Examining the camera we noted no astigmatism, curvature of field, rolling distortion, or pincushion distortion.
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Myopia, hyperopia, and astigmatism are all caused by an imperfectly shaped eyeball, cornea, or lens.
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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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Both nearsighted and farsighted people can have astigmatism.
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Define the following term: astigmatism, binocular vision, focal length, lens accommodation, optic disk, papillary constriction, retinal field, visual field.
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Contact lenses that compensate for astigmatism are known as toric lenses.
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You might choose LASIK if you're nearsighted or farsighted, with or without astigmatism.
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The snowman was made from two tin beads used to calibrate electron microscope astigmatism.
Boing Boing
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Maybe you fall asleep in class because of uncorrected astigmatism.
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By retrofitting a Nexus One with a microlens array or pin-hole array and then shooting beams of light into a person's eye, they can figure out whether you have myopia, hypermetropia or astigmatism and, if so, how bad it is.
I4U News
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The LASIK procedure can improve myopic and hyperopic vision with or without astigmatism in acceptable candidates.
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These Seidel sums correspond to spherical aberration, coma, astigmatism, Petzval curvature and distortion.
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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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Contact lenses can be used most advantageously to correct myopia, but can also be used for hypermetropia and corneal astigmatism.
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In astigmatism, although the eye is perfectly healthy, the cornea is curved more like the surface of an egg, with a steep curve in one meridian and a flatter curve in others.
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There is an optical condition of the eye known as astigmatism, in which the cornea is usually at fault.
A Practical Physiology
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Similar double curvatures were used for concave lenses, and even more complicated corrections for astigmatism.
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The difference between the focusing powers of these two axes, measured in dioptres, is the astigmatism.
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Toric contact lenses can correct astigmatism for most people.
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They aren't as effective in correcting some vision problems, including high degrees of astigmatism, as are rigid lenses.
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The difference between a regular contact lens and a toric lens is that torics have two powers, (one for astigmatism, the other for short-sightedness or long-sightedness).
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Ordinary soft lenses tend to mould to the astigmatic curve, but special toric soft lenses are available for astigmatism.
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Side vision is distorted and oblique rays of light passing through a spherical lens produce astigmatism.
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Maybe you fall asleep in class because of uncorrected astigmatism.
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For pure astigmatism, a lens is required that has no optical power in the normal meridian but has appropriate curvature in the others.
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With all the difficulties which naturally surround such an examination they found that in fifty-two eyes of rabbits, thirty-six were hypermetropic and astigmatic, eight were hypermetropic only, five were myopic and astigmatic, and others presented mixed astigmatism.
Scientific American Supplement No. 822, October 3, 1891
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Six horses were also examined, of which one had normal sight, three were hypermetropic and astigmatic, and two had a slight degree of astigmatism.
Scientific American Supplement No. 822, October 3, 1891
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Similar double curvatures were used for concave lenses, and even more complicated corrections for astigmatism.
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The eyes of five rats examined gave the following result: Some were far sighted, others were hypermetropic and astigmatic, one was slightly myopic and one had mixed astigmatism.
Scientific American Supplement No. 822, October 3, 1891
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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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In fact about 23% of the lenses sold in Australia are sold to correct astigmatism.
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If your eye is squished on one side, called an astigmatism, your lenses should compensate for that.
You Being Beautiful
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Those who are farsighted or who have astigmatism also may be helped by LASIK surgery.
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Associate Professor at the Camera Culture Lab, Ramesh Raskar, who led the project, said the device can be mass-produced for less than $2 a piece and used to diagnose myopia, hypermetropia and astigmatism.
Top Headlines
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Contact lenses can balance the image from both eyes, and correct any irregularities or astigmatism of the eye.
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Corrective lenses such as contact lenses or glasses can usually correct vision in people with astigmatism.
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The glasses do not correct astigmatism, but they are effective against nearsightedness and farsightedness.
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Another type of intraocular lens available is the toric lens, which is shaped in such away as to overcome astigmatism without the need to resort to surgical manipulation of the cornea.
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Later on someone told me that my toric lenses (for people like me with an astigmatism… see how I know all the terminology!) were probably not fitted properly.
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They're called aspheric lenses and are great for people (like me) with slight astigmatisms.
A Brit different
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Amblyopia can also result from a major difference in the refraction between the two eyes, such as nearsightedness, farsightedness, or astigmatism.
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Both nearsighted and farsighted people can have astigmatism.
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Corrective lenses such as contact lenses or glasses can usually correct vision in people with astigmatism.
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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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Perhaps it created a happy astigmatism by which she appeared attractive enough to be desired.
PROSPECT HILL
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During testing I noted no spherical aberration, no astigmatism, no curvature of field, no barrel or pincushion, and no rolling distortion.
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Cubic water" crystal clear above the cloak also dotted with countless white bright spot, known as plating, they can change the direction of the light, the effect of a thermal insulation astigmatism.
博客天下
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When all goes well, nearsighted and farsighted patients alike, as well as those with astigmatisms, end up with vastly improved, sometimes perfect vision.
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The small incision induces minimal postoperative astigmatism (change in the spherical curvature of the cornea).
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The difference between the focusing powers of these two axes, measured in dioptres, is the astigmatism.
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Perhaps it created a happy astigmatism by which she appeared attractive enough to be desired.
PROSPECT HILL
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For lower amounts of astigmatism, often standard lens designs can be used.
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It recently acquired the former niche player Wesley Jessen VisionCare, Inc., which specialized in cosmetic lenses that change or enhance the wearer's eye color appearance, toric convex lenses that correct vision for people with astigmatism, and premium lenses that offer value-addedfeatures such as protection from ultraviolet light.50 CIBA Vision seeks to cut manufacturing costs while producing high volume, especially for its planned replacement and disposable lenses.
The Rule of Three
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Astigmatism may occur with myopia or hyperopia.
