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The first time I took the test was last year in Tokyo, so I used a CRT since international tests have always been on the computer. And when I took the test this summer it was also offered on CRTs. My problem is that the test centers used low quality CRTs, and I could see them flickering. I notice the flickering because I spend so much time in front of LCDs, which operate differently. CRTs do cause eye-strain, and it is not healthy to be staring at a CRT for 5+ hours. I wish the test centers would use LCDs considering they are not that expensive. I've borrowed a CRT from a friend so I can do practice tests on it just to train my eyes.