Originally Posted by ChihuahuaMomma

He never said that his eye doctor (Optometrist or Ophthalmologist) told him this, he said an Optician did. Please do not let your Optician diagnose you, that's not there job. Unless you are confusing terms here. I can help you clear it up.

Optician-Sells glasses, fit glasses, and takes measurements (not a doctor)
Optometrist-Optometry Doctor (O.D.)
Ophthalmologist-Medical Eye Doctor (M.D.), also sometimes a surgeon

Now with that said, even if you do have one pupil bigger than the other, it's nothing to worry about most of the time. If you are REALLY concerned, visit an Ophthalmologist to ease this concern.

Now, was this before or after you were dilated? This is where they put in eye drops and let you hang out for a while and then check your eyes again? If so, your eyes could just dilate at different rates, which is totally normal. And nothing to worry about.