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Eyeglasses correct many different types of sight problems, including nearsightedness, farsightedness or astigmatism (散光). Trying to understand those different numbers on an eyeglass prescription (验光单) requires understanding the measurements optometrists (验光师) use when fitting you for corrective lenses (镜片).

Diopters (屈光度)
The numbers on your prescription are given in diopters, whose short form is "D". It is used to measure the focusing power, or amount of correction.
O.S. and O.D.
Optometrists use the Latin short form O.S. and O.D. to distinguish between your eyes. O.S. refers to your left eye, while O.D. refers to the right eye.
Generally, your prescription will show a number for O.S. and O.D. (given in diopters). The farther this number is on a number line from zero, the more correction your eyeglasses should provide. A plus sign means the eye is farsighted, while a minus sign means the eye is nearsighted.
Spherical Value
This plus or minus number for each eye is called the spherical value, or the degree of nearsightedness or farsightedness you have. Its short form is "S."
Cylinder
If you have an astigmatism, the optometrist will also measure its degree. The higher the number (given in diopters) marked as the cylinder of astigmatism, (its short form is "C"), the more astigmatism there is in that eye.
Axis
An astigmatism is also measured in terms of its axis, which is a number between 0 and 180. The axis of the astigmatism does not relate to the amount of cylinder, just the location of the irregularity of the astigmatism on that particular eye.
小题1:According to the first paragraph, various sight problems ______.
A.should be understood by the patients
B.can be avoided by wearing corrective lenses
C.should be tested by different optometrists
D.can be corrected by wearing eyeglasses
小题2:If you need a pair of corrective lenses, the optometrist will first value the numbers of ______.
A.DioptersB.Spherical ValueC.CylinderD.Axis
小题3:From the prescription above we can learn that Li Hua ______.
A.is farsightedB.is nearsighted
C.has no astigmatismD.is normal in sight
小题4:The text is probably taken from ______.
A.an education reportB.a school bulletin
C.a local newspaperD.an encyclopedia (百科全书)

小题1:D
小题2:A
小题3:B
小题4:D

试题分析:文章介绍了怎么样看验光师的处方,上面的符号和数字都是什么含义,让人们更好的了解自己的眼睛,配一副合适的镜片。
小题1:细节题:从文章的句子:可知各种各样的视力问题,可以通过戴眼镜纠正,选D
小题2:细节题:从第二段的句子;The numbers on your prescription are given in diopters, whose short form is "D". It is used to measure the focusing power, or amount of correction.可知如果你想配一副适合的镜片,验光师会首先验你的眼睛屈光度,选A。
小题3:细节题:从第四段的句子:while a minus sign means the eye is nearsighted.可知OS和OD的数字是负的,说明是近视眼,再根据李华的处方,可知李华是近视眼。选B
小题4:文章出处题:文章介绍了怎么样看验光师的处方,上面的符号和数字都是什么含义,让人们更好的知道这些知识,所以应该是百科全书里面的内容。选D
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A.memoryB.supportC.comfortD.kindness
小题17:
A.offeredB.paid forC.contributedD.supplied
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A.sadlyB.simplyC.excitedlyD.worriedly
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