Hello and thanks for your question. Please allow me to ask some questions myself to better understand your situation.
Do you wear glasses or contact lenses? If glasses, how old is your current pair?
If contacts, how long have you been wearing that particular prescription and how long on your current pair?
Is your fog present all the time, or just when you're reading, watching TV or on the computer for awhile?
Does this fog improve or go away with blinking?