how bad is my eyesight? it says -3.50 on the case of my contact lenses?!

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That is not bad. As long as your vision is corrected with glasses, you really have nothing to worry about. When your vision is bad even with glasses/contacts, you have a problem.
Your changes in eyesight are for the most part in you genes. It may have to do with your whole family needing glasses, it may not. Either way, wearing contacts and glasses is not unhealthy. You can't "improve" your prescription by doing anything, and you can't make it worse. Its just what you have.

Again, even if your prescription does get worse, as long as you can see fine with glasses on, you are perfectly fine and healthy. Nothing to worry about.

Your prescription is fairly strong. You definitely do need glasses/contacts to function normally. I am -2.75 in my right eye and -6.50 in my left, so I have a pretty good idea. It would be bad without your contacts, but perfectly fine with them on.

-3.5 isn't really bad eyesight. I don't think it even makes it into the moderately bad category. This sort of problem with your eyes is due to the eyeball being teh wrong shape to focus light and as you grow this problem shows. Typically it will keep changing until your early twenties either for better or worse. There isn't anything you can do to fix this. its not a matter of your eyes not being healthy , its the fact that your eyeball is teh wrong shape. Eye exercises, eating/not eating the rigth foods wearing/not wearing glasses or lenses, watching TV/computers wont' make any difference. However you'll be able to correct your eyesight with glasses /lenses as you do at teh moment so there is no need to worry. Computers dont' damage your eyesight , but be careful with your contacts and screens as screens tend to dry the eyes which is tricky for contacts.

this is bad, -3.5 is a cylendrical, and it is not going to be corrected easily. u need to take proper exercise for eye muscles, some yoga.

keep away from computer or wear anty glayer glasses.

i am wearing it for last three yrs, it was -0.50 and -0.75 and stoped wearig glasses for a year and now it is -1.25 and -1.50.

you have fairly bad eyesight. Other that wearing glasses/contacts there is not that much you can do. Trust me, I'm 14 and -6.5!