onions

Q: In the English Behishti Zewar, it is written that "Similarly, if there is pain in the eyes and they are sore, and in addition to this they water or tears come out, then too wudhu will break (as in the case of pink eyes). But if there is no pain in the eyes nor are they sore, then wudhu will not break by the mere flowing of tears." Does this mean that the wudhu breaks when we slice onions?