Secrets & Lies (1996) -

Mike Leigh used his signature improvisation method, meaning the actors didn't know the "secrets" until they were filmed.

If you haven’t seen Mike Leigh’s 1996 masterpiece Secrets & Lies , you are missing out on one of the most powerful acting clinics in cinema history. � Secrets & Lies (1996)

I can help you tailor it further if you tell me: Is this for a personal account or a film review page ? Mike Leigh used his signature improvisation method, meaning

It’s a film about "seeing"—literally, with Hortense being an optometrist, and metaphorically, as a family finally chooses to look at the truths they've buried for decades. with Hortense being an optometrist