what to note when drinking milk tea?

Warning from the case: Drink 2 cups of milk tea every day, 25-year-old girl with diabetes, retinal hemorrhage complications
the 25-year-old girl in china, she drank 2 cups of milk tea every day for a long time. recently, she found her eyes hurt, her left eye swollen red, her eyesight was weak, so she went to see her.