The authors attitude towards the Visx machine is that______.
A. it is interesting but not very useful
B. he says it"s a wonderful invention which could replace eye charts
C. it can be useful but he thinks it"s too early to make a switch
D. too much time and money have been wasted on it
查看答案
When the retina reflects the beams, what occurs？
A. Patients have trouble seeing.
B. The ability to focus is gone.
C. No correction is needed.
D. The lens bends the light beams.
Why isnt it important what McKay sees in the machine？
A. He doesn"t like the machine.
B. An eye chart is better.
C. It"s what the machine sees in him that is important.
D. The prototype doesn"t work very well.
What do the thousands of light beams measure？
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.
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