Sometimes they seem to put in more than others.
On one occasion I was totally disabled after drops, it was however an eye-test at an hospital.
Attempts to see (while my wife was driving) were painful and it wasn't a very bright day. Sun glasses did not help.
As mentioned above, the CAA medical drops are not nearly as bad. Ask if you can have the minimum, but be prepared to have a long wait if the worst happens. Do not be tempted to drive if the irises are still wide open...especially at night.