Considering the sheer number and... variety of the things that Bulb Boy licks along the way, it's not really surprising that the final boss, eldritch being though it may be, is given a lethal case of conjunctivitis from BB's tongue based saliva slatherings.
http://tvtropes.org/pmwiki/pmwiki.php/Fridge/BulbBoy
FollowingFridge / Bulb Boy
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