When you have to squint to read something.
"I forgot my glasses at home and can't read this menu. Oh, it's ok I have my Chinese glasses with me! "
(ー_ー)
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The act of squinting your eyes to reduce potential injury instead of wearing proper eye protection.
"Before you cut that rebar you'd better put on some eye protection"
"I cant find mine, I'll just use my Chinese safety glasses, I'll be fine"