Netra是一种便宜并易于安装的附件，通过和移动电话结合，可以快速便捷又不失精准的进行视力自我检查。

Netra is an inexpensive and easy-to-attach add-on for self-testing eyesight quickly, easily, and accurately with a mobile phone. Credit: Andy Ryan, MIT Media lab.

youdao

Netra是一种便宜并易于安装的附件，通过和移动电话结合，可以快速便捷又不失精准的进行视力自我检查。

Netra is an inexpensive and easy-to-attach add-on for self-testing eyesight quickly, easily, and accurately with a mobile phone. Credit: Andy Ryan, MIT Media lab.

youdao