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astigmatism

astigmatism

astigmatism Sentence Examples

  • Airy, the astronomer, corrected his own astigmatism by means of a cylindrical lens.

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  • The correction of astigmatism is in many cases a matter of considerable difficulty, but the results to vision almost always reward the trouble.

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  • It must be so designed as to give as flat an image as is possible consistently with freedom from astigmatism of oblique pencils.

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  • The aberrations of the third order are: (1) aberration of the axis point; (2) aberration of points whose distance from the Aberra- axis is very small, less than of the third order - the tions of deviation from the sine condition and coma here fall together in one class; (3) astigmatism; (4) curvature of the field; (5) distortion.

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  • These anastigmatic lenses, which are manufactured up to X 40, are chromatically and spherically corrected, and for a middle diaphragm the errors of lateral pencils, distortion, astigmatism and coma are eliminated.

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  • If measures are made by placing the image of a star in the centre of the disk of a planet, the observer may have a tendency to do so systematically in error from some acquired habit or from natural astigmatism of the eye.

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  • Astigmatism, also called stigmatism, is an eye condition where the cornea is somewhat elongated instead of round.

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  • According to Sport Eyes, if you have a severe astigmatism (over -1.00) or your prescription is higher than -8.00, you will probably want to get a pair of custom prescription swim goggles instead of purchasing step-diopters.

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  • Surgery led to an increase in against the rule astigmatism, which was the major cause of uncorrected visual acuity less than 6/18.

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  • Q: What is a toric lens A: A special type of soft contact lens called a toric lens which will correct astigmatism.

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  • I have astigmatism - can I wear soft lenses?

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  • The smaller the wound, the less likely the chances of causing astigmatism.

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  • It may then be necessary to adjust or remove sutures to reduce the astigmatism.

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  • Surgical complications, visual acuity at discharge, 6 weeks, and 1 year follow up, and surgically induced astigmatism are reported.

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  • Refractive correction for compound myopic astigmatism contained the following parameters.

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  • The other possible reason is that there may be significant astigmatism.

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  • mild astigmatism may not require treatment unless you are constantly putting demands on the eyes through looking at a computer screen or driving.

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  • Some people may not have clear vision wearing soft contact lenses due to certain eye conditions such as severe astigmatism.

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  • Corneal astigmatism is when the cornea is a distorted shape and lenticular astigmatism occurs when the lens is distorted.

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  • astigmatism correction above 2d.

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  • Astigmatism problem resolved 1500 GMT 07 March 2006 The astigmatism problem resolved 1500 GMT 07 March 2006 The astigmatism problem that became apparent in LT images late last year has been resolved.

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  • astigmatism in the optical system.

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  • David appears to have moderate hyperopia (farsightedness ), with astigmatism, about equal in the two eyes.

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  • Important eye problems related to degraded visual acuity and depth perception include myopia, hyperopia, astigmatism, presbyopia, and retinal rivalry.

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  • The animation allows the user to select from a number of fluorescence photomicrographs and vary the amount of astigmatism in the optical system.

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  • Its design employs three (3) aspherical lens elements to minimize spherical aberration, astigmatism and sagittal comma flare.

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  • Surgery led to an increase in against the rule astigmatism, which was the major cause of uncorrected visual acuity less than 6/18.

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  • to), and does not influence the definition at the (primary) focus, although it may introduce astigmatism.'

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  • The image is greatly affected with astigmatism; but this is of little consequence, if y in (8) be small enough.

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  • In astigmatism, owing to differences in the refractive power of the various meridians of the eye, great defect of sight, frequently accompanied by severe headache, occurs.

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  • The correction of astigmatism is in many cases a matter of considerable difficulty, but the results to vision almost always reward the trouble.

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  • Airy, the astronomer, about 1827, corrected his own astigmatism by means of a cylindrical lens.

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  • If measures are made by placing the image of a star in the centre of the disk of a planet, the observer may have a tendency to do so systematically in error from some acquired habit or from natural astigmatism of the eye.

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  • It must be so designed as to give as flat an image as is possible consistently with freedom from astigmatism of oblique pencils.

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  • The aberrations of the third order are: (1) aberration of the axis point; (2) aberration of points whose distance from the Aberra- axis is very small, less than of the third order - the tions of deviation from the sine condition and coma here fall together in one class; (3) astigmatism; (4) curvature of the field; (5) distortion.

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  • (4) After eliminating the aberration on the axis, coma and astigmatism, the relation for the flatness of the field in the third order is expressed by the " Petzval equation," I 1 = o, where is the radius of a refracting surface, n and n' the refractive indices of the neighbouring media, and / the sign of summation for all refracting surfaces.

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  • The same holds for the errors depending upon the angle of the field of view, w: astigmatism, curvature of field and distortion are eliminated for a definite value, w*; " zones of astigmatism, curvature of field and distortion " attend smaller values of w.

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  • (2) Largest field of view; necessary corrections are - for astigmatism, curvature of field and distortion; errors of the aperture only slightly regarded; examples - photographic widest angle objectives and oculars.

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  • Photog., 1891, 5, p. 225; 18 93, 7, p. 221), cemented objectives of thin lenses permit the elimination of spherical aberration on the axis, if, as above, the collective lens has a smaller refractive index; on the other hand, they permit the elimination of astigmatism and curvature of the field, if the collective lens has a greater refractive index (this follows from the Petzval equation; see L.

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  • These are: (I) chromatic aberration, (2) spherical aberration and (3) astigmatism (see Aberration).

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  • These anastigmatic lenses, which are manufactured up to X 40, are chromatically and spherically corrected, and for a middle diaphragm the errors of lateral pencils, distortion, astigmatism and coma are eliminated.

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  • to eliminate distortion and astigmatism when the centre of rotation of the eye coincided with the point where the principal rays crossed the axis.

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  • Its design employs three (3) aspherical lens elements to minimize spherical aberration, astigmatism and sagittal comma flare.

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  • Astigmatism, also called stigmatism, is an eye condition where the cornea is somewhat elongated instead of round.

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  • There is even a version for for those with astigmatism.

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  • If you have a relatively simple prescription without necessary correction for astigmatism, you may be able to find a pair of goggles that work for you without having to pay too much more than you would for plano lenses.

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  • Cibavision provides daily disposable contacts, weekly disposable contacts, monthly disposable contacts, contacts designed for astigmatism, cosmetic contacts, bifocal contact lenses, and specialty lenses.

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  • RGP lenses are specifically made to obtain sharper vision for those who suffer from astigmatism.

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  • They offer Air Optix Night & Day Aqua, Air Optix Aqua, and Air Optix for Astigmatism.

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  • You can get them whether you're nearsighted, farsighted, need reading glasses, or have an astigmatism.

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  • They will also be much less expensive than colored lenses for those who have astigmatism.

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  • Lenses that could correct astigmatism were developed by a British astronomer, George Airy.

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  • If you have astigmatism, dry eyes, or myopia, you can most likely find a contact lens to suit you.

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  • There are hybrid lenses for those who suffer from myopia, presbyopia, astigmatism, keratoconus, hyperopia, and more.

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  • Nearly 80 percent of those who need distance vision correction have astigmatism, which can complicate a prescription experience.

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  • If you suffer from myopia, astigmatism, presbyopia, or some other form of refractive eye disorders, then a pinhole style of eyeglass might be right for you.

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  • Proclear Multifocal Toric: These monthly replacement lenses are designed for those with astigmatism and presbyopia.

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  • Proclear Toric: Designed for those with astigmatism, Toric lenses are soft and can be worn all day while still being comfortable.

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  • Proclear Multifocal Contact Lenses are even available in a toric version, so if you suffer from astigmatism, they're still an option.

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  • Those who suffer from astigmatism may find comfort and clear vision with them as well.

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  • Be aware that people with high astigmatism may find that certain styles of lens will rotate on their eyes.

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  • Astigmatism is another circumstance that can affect vision-in this case, there is distortion in the eye and this results in a second focal point.

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  • ColorBlends also come in a toric version, making it possible for those with astigmatism to change their eye color as well.

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  • Roughly 145 million of those people could have normal vision with the help of eyeglasses and are simply suffering from problems like nearsightedness, farsightedness, and astigmatism, and many are in low-income countries.

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  • They may be very far-sighted or near-sighted and may have other defects in the curvature of the lens of the eye (astigmatism) that cause images to appear unfocused.

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  • The purpose of eyeglasses and contact lenses is to correct or improve the vision of people with nearsightedness (myopia), farsightedness (hyperopia), presbyopia, and astigmatism.

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  • If the chalazion is on the upper eye lid, it can produce various vision problems including astigmatism, a distortion of the lens that causes fuzzy vision.

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  • Nail-patella syndrome has also been associated with abnormalities of the cornea, cataracts, and astigmatism.

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  • There may be unequal amounts of nearsightedness, farsightedness, or astigmatism, so that one eye will be in focus while the other will not.

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  • There may be unequal amounts of nearsightedness, farsightedness, or astigmatism, so that one eye will be in focus while the other will not.

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  • In astigmatism, owing to differences in the refractive power of the various meridians of the eye, great defect of sight, frequently accompanied by severe headache, occurs.

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