单词：optic center
optic center的用法和样例：
例句
- The visual center of design falls in portraiture above.图案的视觉中心落在肖像画上面。
- So because contacts are right on the eye and move with the eye, there's no optical center.那由于隐形眼镜是直接戴在眼球上，并且跟着眼球移动，所以没有视觉中心。
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