It's been 6 years for me, and my vision is good. Not 20/20, but certainly good enough to drive. My night vision is slightly worse than my day vision, but still much, much better than previously. I'm still amazed I can see the clock numbers in the dead of night.
And yes, your vision will deteriorate over time, as happens to most people. Lasik won't prevent that. Reading glasses could still be needed as you age. Your doctor should give you all of this info during a consultation.
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