rose-tinted glasses

An unduly idealistic, optimistic, sentimental, or wistful perspective on or about something. I know Sarah looks on our childhood with rose-tinted glasses, but I can't put aside how difficult my parents' failing marriage was for all of us. Despite doing worse every quarter for the last two years, our boss keeps seeing the business through rose-tinted glasses. You need to take off your rose-tinted glasses for a moment and realize that there are serious problems in the world that need fixing.