he has very poor eyesight; therefore, he always sits in the front row.

for instance, some people believe that wearing glasses too soon weakens the eyes.

例如，有些人认为过早的戴眼镜会使视力变差。

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my eyesight is very poor. i have to wear glasses for reading.

我的视力很差，看书时不得不戴眼镜。

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screen time doesn't make your eyesight worse.

玩游戏的时间长并不意味着视力变差。

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with such poor vision he really needs glasses.

他视力如此差，所以他需要眼镜。

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he has very little vision in the left eye.

他左眼的视力很差。

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the doctor stared at him for a while and then asked, "well, but how can you prove to me that your eyesight is bad?"

医生看了他一会儿说：“好的，你怎么能证明你的视力差呢？”

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images must be easy to recognize, even for users who have poor vision.

图像要容易辨别，甚至对那些视力差的用户。

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having poor vision; nearly or partly blind.

半盲的视力差的；几乎失明或半失明的。

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bad eyesight is less common in this part.

这地区很少有视力差的人。

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he wears glasses because his vision is poor.

他因视力差而戴上了眼镜。

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windows phone 7 screens are required to respond to at least four simultaneous touch-points.

WindowsPhone7屏幕对于四个点同时触摸产生反应的实现是必须的。

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six months after the operation, the two patients with reduced acuity showed improved vision, being able to read two and four more lines on the sight chart.

术后六个月，两位视敏度较低的病人出现了视觉改善的现象，能够在视力测验表上多看清两到四行字母。

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two still had excellent visual acuity-clearness of vision-which is measured by reading lines of letters on a sight chart.

视敏度也被称为视觉清晰度，通过让病人阅读视力测验表上的字母来衡量。

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now look at this sight-testing chart, please.

现在请看这张视力测验表。

provided by jukuu

[ methods] standard logarithmic visual acuity chart were applied on 19 946 new students of colleges and technical secondary schools from 2003 to 2005. [ results] of the 19 946 new students, the rate of good eyesight was 59.45%.

[方法]采用标准对数视力表，对2003～2005年19946名大中专新生进行裸眼视力检查。

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this new visual picture chart is used for the measurement of visual acuity of 2-3 years old children. bird, fish, house, scissors, cup, apple, umbrella, flower and duck serve as the test optotype.

本视力表所用视标为：鸟、鱼、房子、剪子、茶杯、苹果、雨伞、花和鸭子。

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methods: using a contrast vision chart illuminated at 90 lx, contrast visual acuity ( cva) at 13 contrast levels was measured in 31 pilots with normal visual acuity in normal and in low oxygen.

方法：用投射式双变量对比视力表在90Lx照度下检查31名中国海军航空兵飞行人员呼吸空气和呼吸低氧时13个不同对比度的视力，同步监测心率、血氧饱和度。

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to clarify the advantages of 5-grade notation as well as to describe the development of logarithmic visual acuity charts abroad and compare these charts to the chart used in china.

阐明5分记录的优点，国外对数视力表的发展及其与《标准对数视力表》的比较。

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methods: distant and near vision, positive and negative reserve of relative accommodative capabilities were measured on thirty one freshmen with normal vision by standard vision chart.

方法：应用标准对数视力表对31名视力正常大学新生进行远、近视力及相对调节力正、负贮备的测定。

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methods measurements of contrast sensitivity at 6 spatial frequencies and visual acuity at 4 contrast levels were made in 39 asthenopes.

方法采用对比敏感度函数中6种空间频率和对比视力表中4种对比度的视标对有关人员进行测试。

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