Eye Don't Know About This

I'm getting my eyes checked today because a. it's been 15 years and b. I'm having trouble seeing. So since I haven't been to the eye doctor in a long time, I forget what to expect. I just think he's going to ask me to read from a chart and then give me a lollypop. Now my co-workers are telling me horror stories of debilitating pupil dilation, contrast sensitivity testing and "puffs of air in the eyes". I've had my pupils dilated before, but everything else doesn't sound so cool.