Hi, I need some help. I recently went to have my yearly examination, at a new doctor because I've moved since my last exam. My previous presciption was -3.5 OD,-3.75 OS. Well, she did the exam and told me my eyesight was now -4.0 OD,-4.50 OS. That seems like a drastic change in one year, right? Well, OK so she gave me new contacts and I've noticed that I cannot focus with them. Literally, my eyes constantly cross, I can't maintain straight vision. Is my prescription too strong??