在众所周知的相机出现以前，人们使用这样的暗室根据物体的形象生成精确的影像。
In the days before the kind of cameras we know, people would use such darkened rooms to trace an accurate sketch on the wall based on the projected image.
虽然每块感应器价值6000美元（当然病人使用过后要清洗并重复使用），但从另一方面看，诊所无需再花钱搭建一间暗室了。
The sensors cost $6,000 apiece. (Yes, they're cleaned and reused.) On the other hand there's no need to spend money stocking and maintaining a dark room.
此方法具有测量精度较低，使用环境要求暗室，长时间的测试容易使人眼疲劳等缺点。
This method has the disadvantages of low measuring precision, requiring environment of darkroom, and making eyes tired after a long-time testing.
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