No apologies needed. And you are no burden. So rest easy there.
I too have eyesight issues. My prescription is - 9.
Do you wear glasses, contact lenses at all?
I have looked into improving my eyesight as well. Here is some ideas that I have found.
1...Limit your screen time. And every now and then, look up and into the distance.
2...amberlite suggested eating carrots. It is very true. Cut a carrot into a circle, have a look at it. The circle bit looks like an eye with the iris in the middle. I have been on juice feasts where I drink carrot juice. I can vouch that my eyesight was much clearer. About 4 or 5 carrots makes a good sized juice. So if you have a juicer, give it a go.
3..Eat loads of fruits and vegetables
8...eye laser surgery
9...visit a specialist optometrist that may be able to show you exercises for your eyes