I had Lasik in February 2001 and then got pg with my first that June. My eyes were GREAT after the Lasik, but pg and then breastfeeding really did make my eyesight worse. All the hormone changes do effect your eyesight. It wasn't bad enough to need contacts or glasses, but it was a noticeable difference from the 20/15 eyesight I had after the Lasik.
I breastfed my son for a year and then immediately got pg with my 2nd child (and had a m/c before that), so my eyesight never had a chance to go back to normal. Now that my youngest is 3 1/2, my eyesight is better... I'd say it started getting better about 6 months to a year AFTER I stopped nursing him, and I nursed him for a year. But it still isn't as good as it was after the Lasik. Maybe it would've slowly declined to this point anyway even if I'd never gotten pg or breastfed. And my eyesight is still worlds better than it was pre-Lasik, still no need foir contacts or glasses.
I would recommend waiting about 6 months to a year after you are done having kids and breastfeeding before having Lasik. I think you'll get the best results that way.