好的目镜在视场中央成像锐利，但在目镜的边缘即使最好和最昂贵的目镜成像也不行。
A good eyepiece will render a sharp image in the central parts of the field of view, but toward the edge not even the best and most expensive eyepieces can produce a perfect image.
方法：采用彩色多普勒能量成像的方法，对30例正常人和71例糖尿病患者视网膜中央动脉的血流进行了检测。
Methods: With color Doppler energy imaging techniques to detect blood flow of central artery of retina in30normal cases for control and71cases of diabetics.
目的：研究磁共振成像技术在诊断中央型肺癌的价值。
Objective: Study the technology of magnetic resonance imaging and diagnose the value of the central lung cancer in purpose.
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