I would like to visit an optometrist because I have trouble with my vision. Does it make sense to say that I would like to fix my vision? I don't know how can I say what I mean? :) If you tell the optometrist you have a problem and book an appointment, they will understand why you are there, so don't be shy. You can tell the optometrist that you are having trouble with your vision and you think you might need glasses. Why do you mean by " have troubles in my vision?" What specifically makes you think your vision is not normal? If you get glasses, contact lenses or surgery, this will correct your vision.