Fungsi dan Komposisi Air Mata dihubungkan dengan Kadar Feritin Serum, Durasi, dan Frekuensi Transfusi Darah Pasien Thalassemia Mayor = The Function and Composition of Tear Fluid and Its Correlation with Serum Ferritin Level, Duration, and Frequency of Blood Transfusion in Patients with Thalassemia