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>>846801
there's usually 2 types of lens fixer that "works". neither is magic, you'll still see the crack regardless, but:
1. liquid resin repair kit. brush in, smooth away excess. it never gets completely smooth, and the more you try to smooth it, the worse it gets.
2. pencil-type resin or polymer. gently rub over the scratch, stuff goes in, done.
either way, it's going to look like shit and you'll probably end up wishing just lived with the scratch. both types tend to react with any modern coating you may have and leave a sort of halo effect around the scratch.