验光机里看到的红房子有什么用？

[视频作者] 正经的知识

[视频时长] 0:35

[视频类型] 科学科普

视频素材：人民网科普 https://twitter.com/yiffpolice/status/1226623760649900032 https://www.quora.com/Optometry-Why-do-autorefractors-at-the-optometrist-office-always-use-the-hot-air-balloon-picture-for-you-to-look-at-Youd