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棱镜度测试仪参考标准：EN166、EN167、EN1836、AS/NZS 1067等等
测试目的: 测试偏心镜片中心点，主要针对棱镜度的水平和垂直差异的检测。
棱镜度测试仪测试方法：
1.打开激光钮，人头模型暂勿放置样品，先确定只有一个红点出现在标靶中心位置上，事实上这个红点是由3个点迭置起来的，一个是左眼点，一个是右眼点，而另一个是基座板孔上中心点的孔眼。
2.将模品放置在人头模型上，依测量指示，将样品调整好
3.覆盖样品之左镜片，观察标靶上红点的位置，能够和激光光透射在样品之右镜片一致，记录标靶中心上红点之水平线与垂直线的偏向。
4.覆盖样品之右镜片，观察标靶上红点的位置，能够和激光光透射在样品之左镜片一致，记录标靶中心上红点之水平线与垂直线的偏向。
5.记录最靠近0.5mm的偏向值，在每一次的测量都记下偏向值是否在base in 或base out(base in意指激光光照射到标靶之前的十字形中心轴，base out 意指激光照射出从中心区分歧到外测部份)。
6.每个样品都是重复第2到第5的测试步骤。
7.关掉激光电源。
8.根据每个样品，计算其每个平面(水平线及垂直线)的棱镜度差值。
Prism tester reference: EN166, EN167, EN1836, AS/NZS 1067, etc
Test objective: to test the center point of eccentric lens, which mainly targets the level of prism and the detection of vertical difference.
Prism tester test method:
1. Open the laser button, temporarily don't place the sample head model, make sure there is only one red highlighted in the center of the target now, in fact, the red dot is superposed together by three points, one is left, one is in the right eye points, and the other is on the base plate hole hole in the center.
Place the molds on the head model and adjust the sample according to the measurement instructions
3. Cover the sample of the left lens, observe the location of the red dot on the target, and laser light transmission in the right of the sample lenses, record the red dot on the center of the target in vertical and horizontal bias.
4. The right of the lens cover samples, observe the location of the red dot on the target, and laser light transmission in the sample of the left lens, recording red dot on the target center bias of vertical and horizontal.
5. Record the most close to the 0.5 mm bias, writing in every measurement bias is in the base in or base out (base in refers to the laser light to target before cross the center axis, base out means the laser out from the center to the outer part of the differences).
Each sample is a test step 2 through 5.
Turn off the laser power.
According to each sample, the value of the prism of each plane (horizontal and vertical lines) is calculated.
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