After taking Brysings advice and see a doctor for your vision issues you could try a cleansing. Hexes and curses work, but the majority of the time the hex is self inflicted. This person might say they hexed you, but you begin to notice little things like a stubbed toe or a broken pencil and conclude its the hex. Constant worry over this results in a build up of negative energy and ultimately you curse/hex yourself.
See a doctor, but just relax, don't think about it. A cleansing and protection, even a grounding and centering of your own energy, can fix this problem. Your vision though probably just means you need glasses.