Have Cat Questions? Ask a Cat Vet Online.
The medication they gave you is atropine and it takes a while for it to stop working. Usually it is dosed with a tapering dose, one drop every 12 hours, then one drop every 24 hours etc...only for a few days and then it is stopped. The eye should return to normal in a day or so.
It can take a while....up to two weeks, but usually a week past the last dose, so after the weekend.