An optical store sells once at the counter and three times afterwards
The first sale is the easy one. Someone walks in, gets tested, chooses a frame and pays. Everything after that — the annual check, the lens refill, the prescription sunglasses before a holiday, the spare pair for the office — depends entirely on whether your store contacts them at the right moment. Nobody sets a reminder to visit their optician.
This is why optical retail rewards a CRM more than most retail formats. The dates that drive repeat revenue are known in advance and written on the order: the test date, the lens supply period, the delivery date. All that is missing is a system that turns those dates into a list somebody works on a Tuesday morning.