I worked in jewlery forever, there are screw backs for earrings which are exactly what they sound like and there are also La Puset(spelling is wrong, french, sorry) also called locking back, earring backs which you squeeze then when you let go they lock on. These are not cheap though, so only get if they are important or expensive. Good luck, also another thing I have found that works is those little white cylinders for earrings. They are real tight and you can't see them. I don't know where you can get those, maybe a craft store.
You can get lever backs but these are for dangle only earrings
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