In an extremely rare case, a woman's sudden blindness in one eye turned out to be the first symptom of undiagnosed lung cancer that had spread throughout her body. The woman was 32 years old at the time and otherwise healthy, with no other symptoms and no history of smoking. After an initial eye exam at the hospital, doctors determined her eyes looked healthy. However, upon closer inspection, doctors saw that there was a large, whitish-yellowish mass growing in the