the drops dilate the pupils so that they can make sure that the initial assessment was correct, they are just eye drops, but they take about half an hour to work and the Optician told me when my daughter had these at the weekend that they take about 6-8 hours to wear off so she may experience headaches if trying to do any close work. Also if it is sunny or bright on the day, take sunglasses to wear as your pupils are dilated more and you may experience discomfort. You may or may not be able to drive after having these, I was able to, but my Mother who is in her 70's was not