Can smoking affect your eyesight?

Just wondering. I get so paranoid about things, always end up putting 2+2 together and getting 5! My reasoning is, i do smoke, and i recently went for an eye appointment, and my optician said there had been some 'changes' to my eyesight. This sounded pretty damn cryptic to me, especially since he didn't specify exactly what he meant by 'changes', and my eyesight is very important to me. Please answer, or i'll just end up getting more and more paranoid. I know it sounds irrational, but i just need to know :(