最好是每半年一次，如果发现矫正视力下降，要及时来检查。

Every six months would be best. If your corrected vision decreases, please have it checked immediately.

youdao

最好是每半年一次，如果发现矫正视力下降，要及时来检查。

Every six months would be best. If your corrected vision decreases, please have it checked immediately.

youdao