I am 20 and I have recentlly attended an eye test and my doctor said my vision is fine, but I have vertigo too for which I am taking medicine regularely,
Now, my eye vision is really bad, its really blurry and I cannot read or focus on something or people for more then meretes away, I feel like it is getting worse, but then there are days when my vision is fine.
Why is this?

Medical questions rarely can be answered online. A doctor needs to examine all of you, not just the symptoms you describe, and your history, and family history, and where you live for the types of conditions that are common there, your diet, and so on. We don't even know what kind of doctor you saw, or what the eye test was.

My suggestion is to talk to your medical doctor about the vertigo medicine possibly being related to the blurry vision. There are many drugs that do cause vision problems. You might want to discuss stopping it for 2 months to see if your vision improves. It's also possible that you have another problem that is causing both the vertigo and the blurry vision. I won't begin to guess what that could be, but it's worth looking into. Tests could be expensive, such as scans of the blood vessels in your head. Common conditions such as migraine headaches cause blurry vision. Not all of this is easy for medicine to sort out, and some of it isn't fully understood.

You need to see your regular doctor about this. As joypulv mentioned, it could be side effects of medication or it could be symptoms of another yet diagnosed problem.

Also..an Optician is not the same as an optometrist or ophthalmologist.