Eye surgeries always come with risk. When they go wrong, you can even end up with worse vision than before.
If life is comfortable for you, I wouldn’t change anything.
I’m not sure why the surgery wouldn’t help with near-sightedness. It modifies the shape of the lens in your eye, essentially applying correction directly to your body.
How much can be done and in which direction, depends on the individual. As you’re essentially working with a subtractive tool (using a laser to remove stuff) to modify the optical material in your eye. You’re limited by the shape and amount of material in each persons eye in the first place, and you can’t make changes that would require adding material. As such, there is a maximum amount of correction that can be applied before you run out of usable material, and it varies from person to person.
If more is neded beyond that limit, you will still need glasses.









It would be both.
They seem to be describing a potential defect in the correction that can occur, which causes “lens flares”, “blurring” or “smearing” of bright points of light. This is especially bad at night due to the contrast between lights and the darkness of the night.
It’s similar to a the effect you get with a camera when there are scratches or dents in the lens surface, or if it’s greasy. Except it’s in your eye.