Good for you, and I hope it only gets better from here on in!
It seems to be a fairly unpredictable sort of thing. My mother-in-law had a laser job and swore it made her worse; others have claimed to be better than ever before. Just your luck or just the surgeon?
I´m starting to worry about my own vision now too; sometimes everything is wonderful and other times I have to fight a general blurring that passes by simply looking at a different subject at a different distance. If I was a camera, I´d compare it to a failure to holding focus on the focussed object. But, as I said, shifting focus brings it back sharp, so I doubt it can be a physical flaw in a lens - maybe a muscle problem? Grasping at straws comes to mind.
Ah, the aging eye. It's sort of ironic tragedy that just about the time most of us hit our stride in terms of technique and æsthetic skills—say, age 45 to 50—our eyes start falling apart.
I'm a family doctor rather than an ophthalmologist, so take this with a grain of salt; but as we get older all of us suffer a steady decline in acuity and focusing capacity together with declining light transmission. Even if you don't have a formally diagnosed cataract, the crystalline proteins in the lens gradually 'denature' with age, to the extent that most folks probably lose at least a stop of brightness by age 40, and another stop or two by 60. Most of us also develop 'floaters', extravasated blood cell ghosts that cast a drifting shadow on the retina. I had a retinal tear in my left eye in my 30's, so I have dozens of floaters in that eye. (This makes bird-watching very frustrating on a blue sky day: Gosh, is that another hawk? Nope, just one of my floaters. ) All of us also suffer a gradual decline in capacity to focus up close as the lens ages and becomes stiffer, especially after age 40, so we end up with reading glasses or bifocals. Vision doesn't really fall off a cliff most of the time; generally it's just a little bit worse every year.
Somewhere after age 50 many if not most of us also end up with a vitreous detachment in one or both eyes. The clear gelatin ("vitreous humor") that fills the eye shrinks a bit as we age, and it can abruptly separate from the retina, with the space between them filling with clear fluid. This generally causes a shower of flashes & floaters over the course of a few days, then things settle down. Scary but relatively harmless to vision. Rarely, an old scar tethers the retina to the vitreous, in which case you get a retinal detachment and big trouble.
Cataracts are generally felt to be a consequence of ultraviolet radiation exposure to the lens, compounded by trauma or some medications (like corticosteroids) as well as metabolic problems like diabetes. And since many of us spend a lot of time outdoors in sunny conditions....let's just say, wear a brimmed hat and sunglasses to minimize the ultraviolet dose to the lens. Cataract surgery is generally quick, painless, and very effective. A very small percentage of patients have complications and disappointing outcomes, but they're understandably quite unhappy about it, and they tell all their friends.
If you ever have a sudden decline in vision, (like for example abrupt partial darkness in one eye) don't delay visiting an eye doc. It's often something trivial, but you don't want to miss anything like an early retinal detachment where an immediate fix can prevent a world of trouble.
Common sense eye care: sunglasses to minimize ultraviolet dose. Seriously, never smoke tobacco (ever!). Aim for very tight blood pressure and diabetes control. Protect your eyes from trauma, as in protective eyewear playing raquetball etc. Eat your veggies and consider taking a multivitamin with selenium (like "occuvite") to reduce the risk of age-related macular degeneration (though the data on this is a bit weak).
Hope that helps a bit.