Hi, I'm new here! First post yay!

Well let me first tell you that I was able to control my dreams for a few days when I was little. I remember them vividly. In one dream I jumped down a whole flight of stairs. Then for some reason someone came and started strangling me, so (in the dream) I closed my eyes and woke up on my own will. In another dream I was riding a garbage lid and riding through a trail of leaves like on a roller coaster.

I used to be able to close my eyes in the dream and wake up whenever I want, but for the past couple of years I can't even remember my dreams. and I think my dreams are blurry in general.

Does this have anything to do with the fact that I'm very nearsighted? Can I still have vivid lucid dreams even though my eyes are really bad in real life?

And last but not least, what exactly is a lucid dream? I sort of have an idea of what it is from reading the posts, but I just wanna know the definiition.

Thanks for reading such a long post! I look forward to any replies!