Go and see your GP, (s)he will refer you to an Opthamologist. If the onset is acute or more frequent and you are concerned then go to accident & emergency at your local hospital.
Don't make things worse by guessing.
Sorry to be blunt, but vision is extremely important, especially in this field. Don't risk it and leave anything to chance.
Last edited by Fostex; 5th October 2012 at 17:09.