City Lights (1931)

A little tramp living in the big city has a profound effect on two people he meets. The first is a wealthy man, who the tramp saves from killing himself during the wealthy man's drunken stupor. However, the relationship between the wealthy man and the tramp continually changes depending on the drunken or sober state of the wealthy man. The second is a poor blind flower girl, who lives with her destitute grandmother. The kindness of the tramp toward her makes her fall in love with him, as he is with her. By circumstance, she believes that he is a wealthy man. When he learns that an expensive operation can restore her eyesight, the tramp does whatever he can to earn the money to pay for the operation, even if the result is that she will find out that he is not the wealthy man she believes and which by association may make her change her blind opinion of him.

IMDb: https://www.imdb.com/title/tt0021749