The most common sites of lung cancer metastases are pleura, bone, brain, pericardium and liver.1　Tumor metastasis to the eye is a rare complication of lung cancer. Metastatic cancer to the ocular region most often involves the uveal tract, however, most uveal metastases occur in the posterior uvea, and iris metastases are relatively rare. We describe a patient with adenocarcinoma of the lung metastatic to the iris as the first clinical sign without symptoms of lung cancer.