Having Myopia, Should I wear UV sunglasses only on prescription?

Hi,

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You can use UV glasses in your prescribed glasses.

Actually myopia (near sightedness and using minus glasses) is a separate issue. While UV glasses (ultraviolet) are just a filter incorporated in your glasses that absorb UV light from the sun. No matter you are using plus or minus glasses and no matter how much power. You can ask your optician to make it with UV filter. It is just like your mobile phone and you can order a screen protector of your own choice. It has nothing to do with your glasses number. It just blocks UV light rays that are dangerous to the eye.