Dilation is a process done most times when you visit your eyecare professional.  Drops are used to enlarge your pupils allowing your doctor to get a better look at the inside of your eyes.  While dilation does affect your vision, everyone is different.  Many patients feel comfortable driving themselves after their eyes have been dilated only requiring sunglasses.  Others have a much more significant temporary alteration to their vision rendering them uncomfortable to drive themselves.  If you are unsure how you respond to dilation, it is recommended that you bring a driver with you to your eye appointment.