My Son's Eye Doctor Said That She Needs To Dilate

my son's eye doctor said that she needs to dilate my son's pupil to order to get his actual farsightness? true or false? then my son could not read clearly after his eye dilation. She told me to join the Atropine program to use eye drops to dilate my son's eye everyday for a month, then come back again to measure his actual farsightness? I was very confused? Does the whole process make sense?