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  3. It’s not what Thomas McKay sees in this machine, but what the machine sees in him that determines how well his eyes view the wor

It’s not what Thomas McKay sees in this machine, but what the machine sees in him that determines how well his eyes view the wor

admin2015-02-12  11
问题     It’s not what Thomas McKay sees in this machine, but what the machine sees in him that determines how well his eyes view the world. McKay is demonstrating a prototype device that sends a hundred thousand beams of light into his eye to measure the focusing accuracy of his eye’s lens. As those beams travel into the eye, they’re reflected off the retina, and as they come back they are bent a little bit according to the refracted abnormalities inside the eye. By calculating how accurately the eye’s lens bends the light, the Visx machine can determine how much correction the eye needs to see normally—without a patient ever looking at an eye chart.
    It’s called wave front technology. Physics professor Josef Bille pioneered it at the University of Heidelberg in Germany, twenty-five years ago, as a way to counter atmospheric distortion in telescopic images. He was brilliant enough to know the implications of his findings, and soon eye doctors noticed the possible applications in their field.
    There are a surprising number of eye doctors who know about the new technology but still insist upon their eye charts. Are they merely luddites who resist technological progression? Not really. Many are acutely aware of the limitations. I myself am no expert in this field, but I do know that human vision is more complex than how well our eyes bend light. It would be an oversimplification to simply look at the optical system of the eye and say we have the best correction. Visx wave front technology is a useful tool but optometrists may not yet be ready to throw away eye charts.
What do the thousands of light beams measure?
选项 A、The focusing accuracy of the lens of the eye.
B、Eye color and vision.
C、Where the beams travel.
D、The reflection of the retina.
答案A
解析 属事实细节题。第一段第二句明确说明，十万条光束用来测定眼睛晶状体的聚焦准确度。
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