Definition of astigmatism in English:

astigmatism

noun əˈstɪɡmətɪz(ə)məˈstɪɡməˌtɪzəm

mass noun

A defect in the eye or in a lens caused by a deviation from spherical curvature, which results in distorted images, as light rays are prevented from meeting at a common focus.
散光
Example sentencesExamples
- The surfaces of the lens or cornea may not be smooth, causing an aberration that results in a streak of distortion called astigmatism.
- It is a surgical treatment for short-sightedness, some forms of long-sightedness and astigmatism and is carried out by ophthalmic surgeons.
- For pure astigmatism, a lens is required that has no optical power in the normal meridian but has appropriate curvature in the others.
- People with astigmatism usually need to wear glasses or contact lenses to correct their vision.
- They aren't as effective in correcting some vision problems, including high degrees of astigmatism, as are rigid lenses.
- 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.
- 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.
- In fact about 23% of the lenses sold in Australia are sold to correct astigmatism.
- The glasses do not correct astigmatism, but they are effective against nearsightedness and farsightedness.
- Apart from testing the eye, they supply booklets detailing eye care with particular reference to refractive errors such as myopia, hypermetropia and astigmatism.
- Toric contact lenses can correct astigmatism for most people.
- 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.
- Corrective lenses such as contact lenses or glasses can usually correct vision in people with astigmatism.
- For lower amounts of astigmatism, often standard lens designs can be used.
- Amblyopia can also result from a major difference in the refraction between the two eyes, such as nearsightedness, farsightedness, or astigmatism.
- Side vision is distorted and oblique rays of light passing through a spherical lens produce astigmatism.
- Whether myopia, hyperopia or astigmatism is present, surgical correction attempts to redirect light rays to accommodate the refractive error.
- The degree of astigmatism should not exceed more than four diopters.
- Contact lenses can balance the image from both eyes, and correct any irregularities or astigmatism of the eye.

Derivatives

astigmatic

adjective astɪɡˈmatɪkˌæstɪɡˈmædɪk

Ordinary soft lenses tend to mould to the astigmatic curve, but special toric soft lenses are available for astigmatism.
Example sentencesExamples
- Monet, on seeing those fields, described them as ‘enough to drive a poor painter crazy - impossible to render with our poor colors,’ but render them he did in his astigmatic but beautiful way.
- He swallowed and shifted his astigmatic eyes to the cards in his hand.
- For years I have been astigmatic to a degree that even bats point and laugh at me.
- The astigmatic person does not know which focal line to look at, and hunting between the two may cause eyestrain.

Origin

Mid 19th century: from a-¹ 'without' + Greek stigma 'point' + -ism.

Definition of astigmatism in US English:

astigmatism

nounəˈstiɡməˌtizəməˈstɪɡməˌtɪzəm

A defect in the eye or in a lens caused by a deviation from spherical curvature, which results in distorted images, as light rays are prevented from meeting at a common focus.
散光
Example sentencesExamples
- Side vision is distorted and oblique rays of light passing through a spherical lens produce astigmatism.
- The glasses do not correct astigmatism, but they are effective against nearsightedness and farsightedness.
- Corrective lenses such as contact lenses or glasses can usually correct vision in people with astigmatism.
- For pure astigmatism, a lens is required that has no optical power in the normal meridian but has appropriate curvature in the others.
- 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.
- In astigmatism, the refractive power of the eye is different in different meridians.
- 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.
- For lower amounts of astigmatism, often standard lens designs can be used.
- Amblyopia can also result from a major difference in the refraction between the two eyes, such as nearsightedness, farsightedness, or astigmatism.
- Most refractive surgical procedures were developed to correct nearsightedness, farsightedness and astigmatism.
- In fact about 23% of the lenses sold in Australia are sold to correct astigmatism.
- People with astigmatism usually need to wear glasses or contact lenses to correct their vision.
- The surfaces of the lens or cornea may not be smooth, causing an aberration that results in a streak of distortion called astigmatism.
- Toric contact lenses can correct astigmatism for most people.
- It is a surgical treatment for short-sightedness, some forms of long-sightedness and astigmatism and is carried out by ophthalmic surgeons.
- Whether myopia, hyperopia or astigmatism is present, surgical correction attempts to redirect light rays to accommodate the refractive error.
- Apart from testing the eye, they supply booklets detailing eye care with particular reference to refractive errors such as myopia, hypermetropia and astigmatism.
- The degree of astigmatism should not exceed more than four diopters.
- They aren't as effective in correcting some vision problems, including high degrees of astigmatism, as are rigid lenses.
- Contact lenses can balance the image from both eyes, and correct any irregularities or astigmatism of the eye.

Origin

Mid 19th century: from a- ‘without’ + Greek stigma ‘point’ + -ism.

词汇	astigmatism
释义	Definition of astigmatism in English: astigmatism noun əˈstɪɡmətɪz(ə)məˈstɪɡməˌtɪzəm mass noun A defect in the eye or in a lens caused by a deviation from spherical curvature, which results in distorted images, as light rays are prevented from meeting at a common focus. 散光 Example sentencesExamples The surfaces of the lens or cornea may not be smooth, causing an aberration that results in a streak of distortion called astigmatism. It is a surgical treatment for short-sightedness, some forms of long-sightedness and astigmatism and is carried out by ophthalmic surgeons. For pure astigmatism, a lens is required that has no optical power in the normal meridian but has appropriate curvature in the others. People with astigmatism usually need to wear glasses or contact lenses to correct their vision. They aren't as effective in correcting some vision problems, including high degrees of astigmatism, as are rigid lenses. 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. 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. In fact about 23% of the lenses sold in Australia are sold to correct astigmatism. The glasses do not correct astigmatism, but they are effective against nearsightedness and farsightedness. Apart from testing the eye, they supply booklets detailing eye care with particular reference to refractive errors such as myopia, hypermetropia and astigmatism. Toric contact lenses can correct astigmatism for most people. 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. Corrective lenses such as contact lenses or glasses can usually correct vision in people with astigmatism. For lower amounts of astigmatism, often standard lens designs can be used. Amblyopia can also result from a major difference in the refraction between the two eyes, such as nearsightedness, farsightedness, or astigmatism. Side vision is distorted and oblique rays of light passing through a spherical lens produce astigmatism. Whether myopia, hyperopia or astigmatism is present, surgical correction attempts to redirect light rays to accommodate the refractive error. The degree of astigmatism should not exceed more than four diopters. Contact lenses can balance the image from both eyes, and correct any irregularities or astigmatism of the eye. Derivatives astigmatic adjective astɪɡˈmatɪkˌæstɪɡˈmædɪk Ordinary soft lenses tend to mould to the astigmatic curve, but special toric soft lenses are available for astigmatism. Example sentencesExamples Monet, on seeing those fields, described them as ‘enough to drive a poor painter crazy - impossible to render with our poor colors,’ but render them he did in his astigmatic but beautiful way. He swallowed and shifted his astigmatic eyes to the cards in his hand. For years I have been astigmatic to a degree that even bats point and laugh at me. The astigmatic person does not know which focal line to look at, and hunting between the two may cause eyestrain. Origin Mid 19th century: from a-¹ 'without' + Greek stigma 'point' + -ism. Definition of astigmatism in US English: astigmatism nounəˈstiɡməˌtizəməˈstɪɡməˌtɪzəm A defect in the eye or in a lens caused by a deviation from spherical curvature, which results in distorted images, as light rays are prevented from meeting at a common focus. 散光 Example sentencesExamples Side vision is distorted and oblique rays of light passing through a spherical lens produce astigmatism. The glasses do not correct astigmatism, but they are effective against nearsightedness and farsightedness. Corrective lenses such as contact lenses or glasses can usually correct vision in people with astigmatism. For pure astigmatism, a lens is required that has no optical power in the normal meridian but has appropriate curvature in the others. 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. In astigmatism, the refractive power of the eye is different in different meridians. 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. For lower amounts of astigmatism, often standard lens designs can be used. Amblyopia can also result from a major difference in the refraction between the two eyes, such as nearsightedness, farsightedness, or astigmatism. Most refractive surgical procedures were developed to correct nearsightedness, farsightedness and astigmatism. In fact about 23% of the lenses sold in Australia are sold to correct astigmatism. People with astigmatism usually need to wear glasses or contact lenses to correct their vision. The surfaces of the lens or cornea may not be smooth, causing an aberration that results in a streak of distortion called astigmatism. Toric contact lenses can correct astigmatism for most people. It is a surgical treatment for short-sightedness, some forms of long-sightedness and astigmatism and is carried out by ophthalmic surgeons. Whether myopia, hyperopia or astigmatism is present, surgical correction attempts to redirect light rays to accommodate the refractive error. Apart from testing the eye, they supply booklets detailing eye care with particular reference to refractive errors such as myopia, hypermetropia and astigmatism. The degree of astigmatism should not exceed more than four diopters. They aren't as effective in correcting some vision problems, including high degrees of astigmatism, as are rigid lenses. Contact lenses can balance the image from both eyes, and correct any irregularities or astigmatism of the eye. Origin Mid 19th century: from a- ‘without’ + Greek stigma ‘point’ + -ism.
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